I don't think that Gerry Angiulo ever was the triggerman in a hit based on what I've read and he was the most respected NE boss after Patriarca Sr. I'm pretty sure that he traveled down to Providence to pay tribute to Patriarca and get his blessing to operate in Boston. And over time, he inherited the top seat.

Joey Merlino sure as hell tried to kill a few people, Scarfo Jr. as mentioned earlier and I thought he was also part of the crew that left Joey Chang in the condition he is today (I could be wrong). I would tend to think that he has murdered someone.