: Now officially adopted by Sharon, Rusty navigates college life and a budding romance with Gus Wallace, the brother of the girl he helped identify. Returning Cast & Guest Stars

Season 4 introduces more ambitious storytelling, blending the traditional "murder of the week" format with complex, multi-episode arcs.

: The season concludes with a gripping five-episode arc. A current gangland shooting is tied to a series of unsolved LAPD homicides, forcing the team to confront past failures and a corrupt former detective, Mark Hickman.