Connor McManus is the other half of the McManus twins that become the Boondock Saints. Connor and Murphy become vigilantes after they kill some Russian mobsters in self defense.
Doc: You know what they say: People in glass houses sink sh... sh... sh... ships. Rocco: I got to buy you a proverb book or something, because this mix 'n' match shit's got to go. Doc: What? Connor: Well, a penny saved is worth two in the bush, isn't it? Murphy: And don't cross the road if you can't get out of the kitchen.