If the Made Guys wanted to send a message, it was normal to put about 8 .22 hollow points into the mark's head, stuff him into the trunk of his own car, and park it in long term parking at O'Hare. You could always tell winter was over when bodies started being found because of the odor...
I'm sure Kelly's demise was just an O.D. After all, who would want to shut him up?