(MCT) — CHICAGO — Frank Calabrese Sr., whose lifetime of murder, extortion, bookmaking and brutality as a member of Chicago’s Outfit was laid out in 2007’s Family Secrets Trial, died in federal prison on Christmas Day — “one of the few days out of the year he was a good person,” according to his son.

“I’ve never been comfortable that he was locked up the way he was — but he needed to be,” Frank Calabrese Jr., who testified against his father, said Wednesday. “I am comfortable with the fact that he’s not suffering in there anymore and that no one else has to suffer on the street.”