Lumen Pierce

Lumen Pierce: Vigilante Killer, Partner and Lover

Lumen Pierce
Lumen Pierce wch
Character Profile
Portrayed By
Julia Stiles
Season Five
First Appearance
Practically Perfect
Last Appearance
The Big One
Appears in
Ten Episodes
Full Name
Lumen Ann Pierce
Number 13 (by the Barrel Girl Gang)
Lu (by Owen, ex-fiance)

Early 30s
Personal Status
Marital Status
Immediate Relatives
Unnamed mother
Unnamed father
Unnamed grandmother
Unnamed grandfather
Minneapolis, Minnesota
Professional Status
Killer Profile
"No Known Moniker"
Number of Victims
Modus Operandi
Killing Method
Fatal stab wound to the heart
Method of Disposal
Dismemberment by Dexter, then burial-at-sea
Her rape and torture at the hands of the Barrel Girl Gang caused Lumen to seek revenge upon them.

Lumen Ann Pierce is a character in Season Five of the Showtime series DEXTER.  

With the assistance of Dexter Morgan, she hunted down the group of men who raped and tortured her. 

Hannah McKay, Lumen Pierce, and perhaps Jonah Mitchell, remain the only living people to know Dexter's secret.


Lumen is a 5'3" pretty woman in her early 30s with long blonde hair, and a slender body. She has multiple scars on her back, caused by beatings suffered at the hands of the Barrel Girl Gang. In her initial appearance, she is dirty, and her clothing is ragged, a result of her confinement and abuse.

After Dexter rescues her, she often wears her hair back in a ponytail with light makeup, along with various sets of clothes which Dexter rescued from the motel storage. This includes a hoodie used when she stalks Robert Brunner and later searches Alex Tilden's house with Dexter. Her kill uniform is a navy blue long-sleeved shirt, dark jeans, and gloves that Dexter gave to her.

To keep Dan Mendell from recognizing her, she wore a black wig and heavier makeup to mask her appearance.


When Dexter first finds Lumen, she is terrified and assumes that he’s a member of the group that tortured her. While Dexter keeps her captive at the Visitor Information Center, Lumen remains distrustful of him. She puts up a fight and attempts to escape more than once.

The extent of her psychological damage is apparent when a TSA touches her at the airport. She experiences a panic attack; her vision blurs and sounds are muffled. She assumes the men around her are watching her with the intent of rape.

Despite her horrific experiences, she has fierce determination and takes direct action to kill the men who brutally raped her. She feels that she can't find peace until they are dead.

In time, she grows close to Dexter, with them becoming partners-in-crime, and lovers.


Lumen grew up in Minneapolis, MN. On her wedding day, she left her fiance, Owen, at the altar because she was unable to bear the thought of a mundane life. She then picked up and moved alone to Miami, renting a room upon arrival at the Towne House Motel. One night, Lumen went to a bar called Hurricane 26, from where she was kidnapped. For several days, she was kept captive at River Jordan Camp, where she repeatedly tortured and raped by the Barrel Girl Gang. When they were through with her, Lumen was taken to the attic in Boyd Fowler’s house. It was his job to kill her and get rid of her body. However, before he was able to do so, Dexter Morgan realized that Boyd was a serial killer and murdered him. This left Lumen alive, but in dreadful shape. Because she witnessed him killing Boyd, Dexter was left with the choice to let Lumen die or keep her alive.

Season Five

Dexter captures Boyd Fowler in his house where he carries out an improvised kill ritual. As he delivers the fatal knife thrust to Boyd’s heart, he notices that someone is watching him through a door window. Dexter quickly opens it to find a shivering woman in dirty, ragged clothing. She struggles to escape before collapsing in his arms.

Because the woman witnessed him kill Boyd, Dexter locks her in an abandoned Visitor Information Center. While she’s sleeping, he cleans her wounds and weighs the first rule of The Code - “Don’t get caught.”

After waking, she's terrified of Dexter and tries to escape. She struggles violently until he injects her with M99. While she’s passed out, Dexter takes her fingerprints and afterward learns who she is -- Lumen Pierce, from Minneapolis, MN.

The next day, Dexter returns to the center and finds Lumen still extremely wary of him. When he offers her medicine, she refuses to take it, and lies that her name is “Rachel.” He tries to convince her that he won’t hurt her but she remains fearful. Lumen asks if he’s going to sell her and he assures her that he will not. Suddenly, Lumen runs to the door but Dexter catches her. He leaves her in the center, padlocking the door, as Lumen is heard screaming.

During an online search, Dexter discovers that Lumen had rented a room at the Towne House Motel before she was kidnapped. Pretending to be her husband, Dexter retrieves her belongings from the motel clerk. He looks through Lumen’s stuff and finds a letter from her mother begging her to come home. He drops it all off at the tourist center. After Dexter leaves, Lumen reads the letter and bursts into tears.

Dexter returns the next day to find Lumen lying on floor, apparently unconscious. When he bends down to check on her, she hits him over the head with an object. She runs out the door and padlocks it. However, Dexter's strength prevails and he bursts through the door, giving chase. Lumen almost escapes but she hesitates to enter a car with young men and Dexter captures her.

Dexter takes Lumen by force to Boyd's marsh and shows her the dead barrel girls. He insists that he saved her from the same fate. To prove that she can trust him, Dexter gives Lumen a knife. but she quickly uses it to cut Dexter’s shoulder. When he doesn’t strike back, she’s finally convinced that Dexter won’t hurt her. They sit on the back of Dexter’s car, talking, as she tends his wound. To Dexter’s surprise, Lumen reveals that Boyd wasn’t the only one who had raped and tortured her.

Dexter has released Lumen and she’s again staying at the Towne House Motel. As she’s having breakfast at Boardwalk Cafe, Dexter sits down across from her. She is not delighted to see him, especially when he presents her with a plane ticket to Minneapolis. He thinks it’s best for her to head home to her family. Lumen, however, is filled with the desire to hunt down her attackers, which Dexter advises against.

Dexter looks into Boyd's past, hoping to find a link to his associates. When he returns to Boyd’s house, it’s clear that someone has broken in and frantically searched for something. Dexter discovers blood and a thumbprint. To his surprise, when he runs them, they belong to Lumen.

Dexter returns to Lumen’s motel and knocks on the door, but when no one answers, he breaks in. He finds a wall covered with sticky notes and obsessive research, much like Frank Lundy's Trinity research. It’s apparent that Lumen has concluded that an ex-con, Robert Brunner, is one of her attackers. Dexter also notices that she has been sleeping in the closet as a way to keep her safe.

Dexter confronts Lumen at the Boardwalk Cafe and again insists that she give up her manhunt. At one point, he grasps her arm, causing her to yell, “Don’t touch me!” This startles the others in the cafe and Dexter tries to hide his face. The two once again part ways, as both look for Robert Brunner.

After confirming that Brunner is rapist, Dexter finds him living under the Julia Tuttle Causeway with other released sex offenders. Dexter strikes up a conversation and injects him with M99. However, he discovers that Brunner can’t be one of Lumen’s rapists because he's wearing an ankle bracelet that tracks his location. He ends up releasing an unconscious Brunner near the bridge.

Dexter returns again to Lumen’s motel, only to learn from the clerk that she's off to “Tuttle Bridge.” Meanwhile, Lumen is walking around under the bridge, wearing a dark gray hoodie and dark pants that hide most of her features. The men in the area assume that she's just a skinny guy. As she searches for Brunner, her fear and anxiety return. She finally spots Brunner, her target. With her hands shaking, Lumen lifts a gun to take Brunner’s life. However, Dexter intervenes and, after a brief struggle, he convinces her that Brunner is not one of her attackers. Lumen is horrified at her mistake and agrees to leave Miami.

Later, at the airport, Dexter and Lumen bid each other farewell and he finally tells her his last name. After Dexter leaves, Lumen is required to undergo a body search. A female agent pats down her body, as man after man passes by, and it causes Lumen to suffer an anxiety attack. In the final scenes, Lumen enters a taxi outside the airport, revealing that she never boarded the plane out of Miami.

Donning a black wig, spaghetti strap dress, and high heels, Lumen heads off to a bar called Hurricane 26 in search of her attackers. She catches a whiff of old sweat and chlorine on a man and recognizes the odor.

Dexter, who is about to kill Lance Robinson inside a RV, receives a panicked phone call from Lumen who reveals she’s still in Miami. She needs his help because she just shot one of her rapists and doesn’t know what to do with the body. Thoroughly annoyed, Dexter throws Lance, unconscious and wrapped in plastic, into the back of his car.

When Dexter arrives at the warehouse, he and Lumen begin to argue. She leads Dexter to the body, but it’s gone. Dexter is angry that the man escaped, leaving a pool of blood. Dexter orders Lumen to describe the entire scenario and he locates four bullet holes in the area, proving that the man was shot once. Dexter follows a blood trail until he finds the guy hiding under a floor grate. He pulls the man out and removes the ID from his wallet. His name is Dan Mendell, a dentist for children, and seemingly harmless. Dan insists that he doesn’t know Lumen and calls her crazy. Meanwhile, Dexter receives a text that police are on the way to the warehouse because someone heard gunshots and called it in.

Dexter thinks Lumen shot the wrong guy until he overhears Dan on Lumen's phone telling an associate that she survived. When Dan threatens Lumen and calls her a cunt, Dexter snaps his neck. Lumen washes down the crime scene with a hose as Dexter gets blood-free clothes for them.

A new problem arises when Lance wakes up and escapes from Dexter’s car. Dexter orders Lumen to go to his house and gives her the address and key. He then chases after Lance and catches him in the nick of time. Dexter strangles him and sets it up to appear that Lance and Dan killed each other during a kinky sex encounter. When the homicide team arrives, Masuka labels the scene “Autoerotic Mummification."

When Dexter walks through his house, he’s startled to see Lumen lying in the bathtub in the same position in which he found Rita murdered. After she grabs a towel, Lumen and Dexter sit by the tub and discuss their pasts. Lumen feels that she won’t rest as long as the men who brutalized her are still out there. Dexter, not having helped Rita, decides to help Lumen.

Now that Lumen’s rapists know she’s still alive, she is hiding out in Dexter’s house. He brings her food and asks for details about her attackers. She tells him about "Watch Guy," who kept her tied to a chair, blindfolded. He tormented her by holding a ticking watch to her ear while whispering, “Tick..tick..tick. That’s the sound of your life running out.” Next, she describes “Suit-and-Tie.” He always removed his jacket and carefully folded it before assaulting her. Lumen is sure that she’ll recognize him because he always took off her blindfold.

Dexter is called to a crime scene on a public street. He finds a wrecked pickup truck, five dead women lying on the street, and five old barrels nearby. He recognizes them from the marsh and realizes that someone attempted to move the bodies, but had an accident.

The driver is nowhere in sight, having run away. Dexter hurries to the truck to look for evidence, but Vince Masuka has beaten him to it. They are fingerprints (that later match to Cole Harmon) and a folded jacket, which Dexter assumes belongs to the Suit-and-Tie Guy, who always folded his jacket before raping Lumen. The truck is registered to motivational speaker, Jordan Chase, the same guy on Boyd’s Take it! CDs. Meanwhile, Stan Liddy calls Quinn to tell him that a girl is living in Dexter’s house and the For Sale sign has been taken down.

Jordan and Cole show up at the station to clear their names, and Dexter manages to take a picture of them. He later shows it to Lumen, and she recognizes Cole (because he didn’t blindfold her), but not Jordan. Lumen’s nerves are frazzled as she hasn’t been sleeping and is drinking copious amount of coffee. Dexter tells her that she can quit now since Florida has the death penalty. However, she insists on killing the men herself and he understands. However, he first must derail the police investigation into Cole.

Dexter and Lumen return to Boyd's house to remove all evidence of her presence. She fears entering the attic where she was tied up for two days. She describes how she chewed on the rope for hours until she freed herself, only to see him kill Boyd.

On the way out, Dexter grabs Boyd's wallet and plants it in Cole’s pickup truck. During a second sweep, Masuka finds it. The homicide team investigates Boyd’s house and they find twelve numbered locks of hair, a large barrel, jumper cables, and the attic where the girls were kept before being killed. Instantly, Boyd becomes the new prime suspect in the "Barrel Girls Case."

Again at the station, Cole and Jordan deny that Boyd is a friend, but a stalker who attended the seminars.

Liddy shows up at Quinn’s apartment, and demands more money to continue his investigation into Lumen.

Leaving Lumen in the car, Dexter breaks into Cole’s house and finds a photo of a group of five young men. Suddenly, Cole attacks him from behind. The house alarm goes off as Lumen appears out of nowhere and beats the crap out of Cole with a flashlight. The two escape before Cole regains consciousness and recognizes them.

Dexter brings Harrison to the house and Lumen takes him into her arms.





In trying to find Lumen, Dexter tracks down the address of Jordan Chase's camp. He speeds to the scene in a stolen car but, in his haste, flips his car over a backhoe on the road. Jordan captures Dexter and brings him to the basement where he’s holding Lumen. Jordan opens Dexter's knife kit, only to notice that one knife is missing. Dexter immediately stabs Jordan in the foot, incapacitating him, and frees Lumen. They strap Jordan to a table where, after he taunts Lumen, she stabs him in the heart.

Meanwhile, Debra has tracked Jordan to the camp. She walks in as Dexter and Lumen are cleaning up behind a plastic sheet that conceals their identities. Feeling sympathy for the Barrel Girls (having gone through a similar ordeal), Debra advises the two to be gone within an hour to avoid the police. She leaves without arresting them or realizing who they are.

Having killed the final member of the Barrel Girl Gang, Lumen realizes that her darkness is gone and she can no longer can stay with Dexter. He takes this hard, but he understands.

Dexter solemnly walks across the beach to Harrison's one-year birthday party. He sits with Astor who asks about Lumen. Dexter tells her that she left, and thinks that he helped her.

Season Seven

When LaGuerta tries to prove that the Bay Harbor Butcher is still at work, Debra meets with Dexter to make sure he's covered his tracks. During their conversation, Deb realizes that Dexter’s former tenant, Lumen. was actually his lover and partner in the murders of the Barrel Girl Gang. Dexter insists that it doesn’t matter and even if LaGuerta learns about Lumen, she won't betray Dexter or incriminate herself.


Attempted Victims

  • Robert Brunner - She intended to shoot him, but Dexter intervened and informed her that he was not one of the men who raped her.
  • Dan Mendell - Shot him, but only wounded him. Afterward, Dexter snapped his neck because he was guilty and deserved to die.

Witnessed Deaths

Attempted to Kill Lumen

Theme Music

As an important character, Lumen has her own featured style of music. It’s a gentle tone, using instruments from Native American tribes to likely symbolize her currently difficult life.


  • Lumen is Dexter's second apprentice and the only one that is still alive as Miguel Prado and Zach Hamilton were killed.
  • Lumen is from Minneapolis, MN. When her ex-fiance shows up, they talk about their "beer runs in Madison". (This is because it is illegal to sell alcohol in Minnesota on Sundays, so beer runs to Wisconsin are a common practice of University of Minnesota students). Although the common practice is a beer run to Hudson, which is where the first liquor store is across the Wisconsin border. Madison is 269 miles away, Hudson is 27.
  • The lumen (symbol: lm) is the SI derived unit of measure of the power of light perceived by the human eye.
  • In medical terminology, a Lumen is referred to as a cavity or opening within a tube or a tubular organ. 
  • Lumen is the Latin word for Light or brightness, perhaps reflecting the enlightening effect the character has on Dexter and his personal Darkness.
  • Lumen is one of the few major characters to have a known middle name.
  • Lumen is currently the only other main protagonist in the series to have killed a main antagonist (Jordan Chase) other than Dexter. He allowed her to kill Jordan since Jordan was her main antagonist rather than his own. After Season Seven, Debra Morgan also holds this distinction.
  • Lumen and Hannah McKay are the only surviving characters to know Dexter's secret. Lumen, having witnessed it first hand, possesses extensive knowledge of his activities as a serial killer.

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