Bonventre became a captain in the Bonannos at age 28. He was indicted, along with the Zips Baldo Amato and Sal Catalano, in the famous "Pizza Connection" case. Anthony M. Destefano, in his outstanding bio of Joe Massino, says Massino ordered Bonventre's murder and had Sal Vitale organize it. Here is the relevant passage from Destsefano's book:

"Why did Bonventre have to die? The FBI speculated that he had offended someone, possibly in another crime family, with poor quality heroin. Another assumed that he had gathered too much power too quickly and because he was so ruthless that he was viewed a threat to boss Philip Rastelli and his supporters such as Massino."

Hope this helps.