S2·E2 Devil at the Door

When 36-year-old computer programmer Lisa Valdez fails to show up for work, her apartment manager finds her brutally murdered in her tiny studio. Her body is riddled with stab wounds, the walls are covered in blood. Evidence shows the killer cut off her long, dark hair, taking it as an apparent trophy. Detectives ask, could she be the victim of a brutal serial killer? Or was Lisa murdered by someone she knew? Clues left on an answering machine point to a co-worker who was known to have feelings for Lisa, but two bloody fingerprints left on a toilet seat clear him as a suspect, and the case goes cold for thirteen years. Things heat up when a detective gets a hit during a search of the state's DNA database, leading to an unsuspected person from Lisa's past.