Given that parts of the Trilogy are based on a version of real-time events, that statement may have been a reference to a Bonanno family member that died of a heart attack. I believe that Joe Magliocco who succeeded Joe Profaci died of a heart attack also.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."