A shotgun blast to the back of the head would suggest that. I live in Philadelphia and have always been interested in the Mafia history of it. As of now, the Irish control most of the narcotics, loansharking, etc. They're called the K&A Gang if you're not familiar with them. Pretty tough guys, Scarfo used them for hitmen for some hits and never tried to upset them.

K&A stands for Kennsington & Alleghaeny. In 2002 a mobster named Ray Matorano, upon his release from prison, had a plan to take over the Philadelphia Mafia. He requested backing from the Five New York Families. The K&A Gang got wind of this and he was killed on the way to his docotr's office. Motorano planned to finally rid Philly of K&A. Surprisingly, the Mafia Commission did nothing about the hit, since Philly has been a mess for quite some time.

As for Scarfo, the guy was a Psychopath. As a Boss he would go out with his guys on hits because he enjoyed the experience. Apparently during a hit, he grabbed a gun from a soldier started shooting the target and shouted, "I love killing people".