Richard DeAngelis was a Baltimore native, an actor and comedian who was best known for playing Raymond Foerster in the HBO series 'The Wire'.
The IMDb lists him as playing Foerster in six episodes of the first season, and seven episodes of the third season. But they also list these appearances as guest shots. As there were such a limited numbers of episodes in each season of 'The Wire', I think he has every right to be considered a member of the regular company of players.
At some point during the second season, when he was not seen by the home-viewing audience, Raymond Foerster was elevated from the rank of Major to that of Colonel.
As for his role in the movie sequel to 'Homicide: Life On The Streets', he is only listed as a nameless witness. I don't think he was appearing as Foerster, even though both series took place in Baltimore. But he could have been Foerster's twin brother, thus linking the two series unofficially.
"The Wire" playing Major/Colonel Raymond Foerster" June 2002 - December 2004
Homicide: The Movie (2000) (TV) .... Witness #1