David Della Rocco is an American comedian and actor best known for his supporting role in the 1999 film The Boondock Saints. Della Rocco is a friend of The Boondock Saints writer and director Troy Duffy and his role was written specifically for him, playing a character also named David Della Rocco, bringing many of his reallife mannerisms and flair to the character, as well as the characters nickname, The Funny Man. He played the part of a lowlevel mobster who helps his two friends, the MacManus brothers, in ridding Boston of criminals and evil. David Della Rocco returns as Rocco in the sequel The Boondock Saints II All Saints Day in a dream sequence guiding the MacManus brothers on their mission.
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Source: Wikipedia