This episode would seem to be the precursor to producer Tom Fontana's gritty cable TV series Oz. Most of the homicide detectives are dispatched to a maximum security prison, where two inmates have been killed in a riot. Surrounded by several of the criminals whom they put away in earlier episodes, the detectives follow a lead to the possible murderer -- but it turns out to be the wrong man, and more blood ends up being shed. Left behind at the precinct station is Frank Pembleton (Andre Braugher), who insists upon hurting his chances to fully recover from his stroke by practicing on the police firing range. ~ Hal Erickson, Rovi