CSI: Crime Scene Investigation: Season 5, Episode 20

5 - 20:

Captain Jim Brass journeys to LA after Ellie asks for a favor in investigating her friend's disappearance. There, with the help of Warrick who is in LA for a conference and a friend in LAPD, Brass finds his investigation interrupted by higher powers. While he and Warrick ultimately are able to find Ellie's friend's murderer, he is unable to bring the perpetrator to trial. Disappointed, he leaves LA and return to Las Vegas.