Karen is a character in DEXTER. She is a forensic technician working for Miami Metro Homicide and works on scene at Brian Moser's Apartment where the Ice Truck Killer killed most of his victims. Dexter, while dealing with the disappearance of his sister and being unable to think, asks Karen to be in charge of evidence and runs through her duties really fast. She then asks Vince Masuka if he's in charge and Masuka responds by saying "I guess he is now", due to his upfront and hurried approach. Karen continues to reappear throughout the series, usually at crime scenes in the background and is even present during Dexter and Rita's Wedding along with most of Miami Metro Homicide.
As a background character, she is one of few that is credited with both her name and a general title. In several episodes she appears in she is credited as "Technician" rather than by her name.