Stefano, son of the Mafia Don Angelino Ferrante, is killed by Gaspare Ardizzone (John Saxon) for refusing to sell some valuable land. The old don sends for Ferrante Santino Billeci from America, in the hope that he'll be able to help in getting revenge. But Gaspar, meanwhile, is becoming the most powerful and ruthless boss of the area...
Unfortunately the movie Family Killer is not yet available on HBO Max.
| Directing | Vittorio Schiraldi | Director |
| Writing | Vittorio Schiraldi | Novel |
| Camera | Marcello Gatti | Director of Photography |
| Writing | Vittorio Schiraldi | Screenplay |
| Sound | Enrico Simonetti | Original Music Composer |
| Editing | Franco Fraticelli | Editor |
| Production | Arcangelo Picchi | Producer |
| Art | Enrico Sabbatini | Production Design |
| Crew | Basilio Patrizi | Special Effects |
| Costume & Make-Up | Enrico Sabbatini | Costume Design |
