Detective Madison is a character in Showtime's series DEXTER.
She is one of many homicide detectives working in the Miami Metro Homicide Department. She is assigned to FBI Agent Frank Lundy's Task Force in an attempt to find out the identity of the Bay Harbor Butcher. She's identified via a blackboard in the background, being assigned to an unknown victim.
Although she is not officially announced, it is assumed that she, along with several others, were added later to investigate the bodies and victim's past.