Homicide: Life on the Street S05E13 - Have a Conscience

An Asian store owner, a war hero, tried to forbid dope dealers from operating outside his store. His killing leads detectives to Mahoney--again he is too "clean" to catch. Mahoney's parting shot to Kellerman throws the detective into a tailspin of depression. Lewis, his partner, follows up and tries to prevent another partner's suicide.