Southland - Season 4, Episode 5
John tries to save a suicidal teen in a situation that hits extremely close to home. Sammy convinces a former addict to be an informant, with devastating consequences. Tang (special guest star Lucy Liu) gets a visit from someone in her past. And Lydia and Ruben (guest star Dorian Missick) investigate a supposed home invasion that appears to have been staged to cover up murder.