Denis Colin Leary (born August 18, 1957) is an American stand-up comedian and actor. He first came to prominence as a stand-up comedian, especially through appearances on MTV (including the comedic song "Asshole") and through the stand-up specials No Cure for Cancer (1993) and Lock 'n Load (1997).
From Denys or Denis, the medieval French forms of Dionysius. Saint Denis was a 3rd-century missionary to Gaul and the first bishop of Paris. He was martyred by decapitation, after which legend says he picked up his own severed head and walked for a distance while preaching a sermon.