Quentin Glass (Will Patton)

Quentin Glass was the right hand man and best friend of Howard Saint. Quentin leads the massacre of Frank Castle and his family. Through Mickey Duka's spying, it's revealed that Quentin is secretly gay and Frank takes photographs of him kissing another male in an alley. Castle manipulates Howard into believing Livia Saint and Quentin are having an affair, with Howard oblivious to the fact of his close friend's homosexuality. Quentin comes home to find his furniture moved and Howard throws a knife at the ground, urging Quentin to pick it up. Quentin doesn't since he is confused and Howard does it, and stabs Quentin and which kills him.