Originally Posted By: calabresesoldier
I wanted to know if anyone knows why Frank Nitti killed himself, I really never found much information on that topic. He was the outfit boss, and went to the tracks and killed himself, does anyone know?

This is what I've found on it.

"A severe claustrophobe as a result of his first prison term, Nitti dreaded the idea of another prison confinement. It was also rumored that he was suffering from terminal cancer at this time. For these or possibly other reasons, he ultimately decided to take his own life."