Seems like the most likely suspect---Tommy Agro killed Tommy since before GoodFellas and Pesci's portrayal, there wasn't much info out there. In Joe "Dogs" Ianuzzi's book there was just one page dedicated to discussing T.A. killing DeSimone and his brother, who was a suspected or confirmed rat. He joked about killing the other DeSimone brother to complete the trifecta. This was before GoodFellas. After that all of the sudden Tommy became a bit of bigger deal and of course who better to say killed him in your book than Gotti himself after he had passed away in prison.
It may have been but IMO the Gotti crew did it. Now wether it was Gotti or someone in his crew IDK but I can’t see them letting Desimone kill people close to them especially Foxy and not taking care of the problem themselves. It wouldn’t look right them asking another Gambino crew so handle it, Gotti had shooters in his crew and I know when they were going to use the father in law, Mike Roccaforte Sr(the father of current Soldier Mike Roccaforte Jr) and Roach Rampino were going to be the shooters...
