It's very easy to mix-up the Campisi's, since they had many Peter's in their family.
Peter "Pipi" Campisi that you're thinking of Belmont was found stuffed in the trunk of a car in Manhattan with $20 dollar bills scattered all over it. Him and Tiny Manzo were accused of skimming from a mob casino on Staten Island.
Peter "Petey Black" who worked close with Cagno, died from chocking on a piece of lobster at a Father's Day dinner in 2002.
It reminds me of Goodfellas, how everybody was named Peter or Paul and married to women named Marie. lol