In the Season 8 finale ("For Gedda"), Warrick was held for questioning after the murder of mafia boss Lou Gedda. Earlier in the season, Warrick had become involved with a woman connected with Gedda. After she was killed, Warrick became a prime suspect in her murder. During Warrick's investigation, rumors began that Gedda had a mole in the LVPD. Gedda phoned Warrick to inform him that he was "ready to talk". During the discussion, Warrick was framed for Gedda's murder. The night shift crew was kept from the case, which is processed by Conrad Ecklie and the day shift crew. Grissom requested that Ecklie allow them to process the raw evidence after the day shift crew has had their turn, in order to draw their own conclusions. In doing so, Grissom's team discovered that another LVPD officer was involved in Gedda's murder and the LVPD did not press charges against Warrick.
After Warrick's release, Grissom's team ate at a local diner to celebrate his acquittal. Nick asked Warrick if he wanted to go for a beer, but Warrick passes. As he headed to the back alley and got into his parked car, Undersheriff Jeffrey McKeen approached and asked him about the case. Warrick reminded him that Gedda's mole is still out there and that he will keep searching for him. The Undersheriff says to Warrick, "That's what makes you a great CSI", then shot him twice, cleaned the gun of his prints, dropped it in the car, walked away as Warrick slumped onto the steering wheel, and called in the shooting.
