She was the wife of an undercover police officer.
Kara and Ricky Simmons were married for an unknown number of years. At some point, she and Sergeant James Doakes began a relationship that resulted in her seeking a divorce from Ricky. However, she didn't want to bring up the subject while he was working undercover.
After ten months, Ricky refused to come out from his undercover assignment. Unfortunately, he was discovered to be a cop and was murdered by Norberto Cervantes (on orders from Carlos Guerrero). Ricky's body was found under a bridge.
Cervantes then broke into the Simmons residence. Kara tried to call her husband for help, but he didn't answer. While begging for her life, Kara was shot in the back. Her phone was found under her sofa, with a recording of her voice and the sound of a gunshot. Kara survived for a short while in the hospital, but died from massive heart failure.
Sgt. James Doakes and her brother continued to investigate Guerrero. Eventually, due to McNamara setting up Doakes, Guerrero was arrested for the attempted murder of Doakes.