Street Kings (2008)

Tom Ludlow, a veteran LAPD Vice Detective, sets out on a quest to discover the killers of his former partner, Detective Terrance Washington. Captain Wander's, Ludlow's supervisor, duties include keeping him within the confines of the law--and out of the clutches of Internal Affairs Captain Biggs. Ludlow teams up with a young Robbery Homicide Detective to track Washington's killers through the diverse communities of Los Angeles. Their determination pays off when the two detectives track down Washington's murderers and confront them in an attempt to bring them to justice.