CBS

Season 3: Episode 22 - Cold Reveal

Cold Reveal: ­Stella is shocked when she receives a visit from Det. Scotty Valens (from “Cold Case”), who tells Stella that her DNA was found on a bloody jacket connected to a Philadelphia cold case. Valens and Stella work in tandem to discover the connection, which strikes closer to home than Stella would have ever imagined: the jacket belonged to her former foster sister. But was she the victim or the killer? A teenager trying to win an online contest for the craziest stunt recorded on video loses big when his human slingshot stunt leads to his death. Also, following the death of a serial killer at Mac’s hands, the Chief of Detectives, Mac’s nemesis, opens an Internal Affairs investigation on the lab.