Diamond's first big break came in 1995 when he joined the cast of Homicide: Life on the Street as Det. Mike Kellerman. Diamond's character was written out of the series at the end of season six, although he would reprise his role as Kellerman for a two-episode story in the show's subsequent seventh, and final, season. In 2000, a feature length TV movie was produced to wrap up the series, which saw the return of all the major Homicide cast, including Diamond. Recent film roles include a remake of High Noon (2000); S.W.A.T. (2003); Spider-Man 2 (2004); and Good Night, and Good Luck. (2005).
As well as playing the recurring role of Stuart Collins on Judging Amy from 1999 to 2003, Diamond has guest starred on Crossing Jordan, The West Wing, Medium, Numb3rs, Stargate SG-1 and Without a Trace. He was also promoted as one of the main cast members of The Shield (2002), appearing as Detective Terry Crowley, so as to surprise viewers when he was murdered at the end of the first episode. He portrayed Inspector Jack Vasser in the fall 2007 NBC series Journeyman until its cancellation in December 2007 due to low ratings.
Diamond played Dominic in the original pilot, "Echo", with his character being intended as a one-episode-role. While shooting for season one was under way in October 2008 Joss Whedon announced that "Laurence Dominic (played by Reed Diamond), who was written just for the now-defunct first ep, has stuck like fly-paper, and Reed is very much in the family for the present".
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