I have a news article from the day after his was hit. According to witnesses 2 cars were chasing Chuck Nicoletti's car and they ended up in a strip mall parking lot where the gunman got out and shot Chuckie. It mentioned that his car was left on and overheated while paramedics took him away. He didn't immediatly die. I think he died 6 hours later. My theory is that he was loyal to Mooney and the new faction of Aiuppa/Cerone had not use for a aging hitman.