Numb3rs
Lieutenant Gary Walker
All information about the movie/show is taken from IMDB.
End of Watch
Episode 15 from season 3:
Don and the team reopen a cold case when a LAPD badge turns up at a construction site.
When Charlie joins the investigation, they attempt to track down the owner of the badge,
an officer who has been missing 17 years. Meanwhile, Alan is informed that he's being sued.
Photos here and here.
Screencaps:
