Sort of. He was actually killed by a bullet that had lodged in the barrel from a previous issue with the weapon. The blank just fired the bullet that was lodged in the barrel.
People have killed themselves with blanks though, usually screwing around pretending to commit suicide and then accidentally doing it. I remember reading about an actor that put pistol loaded with blanks up to his head and pulled the trigger. There’s enough gas force coming out the end to put a hole in you at that range.