Death Threat M Squad : Season 2 Episode 24

Frank and the Captain are at a restaurant. Frank is waiting on the street when someone tries to shoot him. He starts to work through a list of possible suspects. They think it might be Stevens who had claimed Frank has framed him. Stevens says he's going straight, but the other people who testified against him have gotten some death threats. Then one of them is killed. Frank still thinks it's Stevens, but he has an alibi. He was at a church event.