New Tricks: Season 3, Episode 4

3 - 4: Diamond Geezers

A notorious criminal suspected of murdering a police informant returns to the country, prompting Pullman to reopen the case. While Halford feels responsible for not preventing the victim's death at the time, Standing finds his past indiscretions coming back to haunt him. However, evidence emerges that the crook's henchman may be concealing dark secrets from his boss.