Hollywood lost one of its most reliable stalwarts -- and the Screengrab lost one of its favorite character actor "That Guy!"s -- when Robert Prosky died Tuesday in a Washington, DC hospital from complications following heart surgery.  He was 77 years old.

Probably best-known for his television work, especially as the dispatch sergeant who replaced Michael Conrad's Sgt. Esterhaus on Hill Street Blues, Prosky -- born Robert Prozuczek in Philadelpia -- also had a lively screen career and appeared in nearly three dozen big-screen productions, from Michael Mann's Thief to Tim Robbins' Dead Man Walking.  Already in his fifties when he netted his first movie role, Prosky specialized in playing world-weary older men, from working-class fathers to judges.  He had a light touch with character, and one of his most beloved film roles was as the Al-Lewis-like horror movie host Grandpa Fred in the cult hit Gremlins 2:  The New Batch.

For all his work in film, though, Prosky was most closely identified with his work on stage, and it was the theater which he enjoyed the most.  He appeared in over 200 stage productions, nearly half of them at the Arena Stage in his beloved hometown of Washington, D.C.  Although he did a great deal of work elsewhere -- including, famously, originating the role of Shelly "The Machine" Levene in David Mamet's Glengarry Glen Ross -- he worked most of his life to support and raise the profile of the theater in Washington.