Snake Eyes - S7-E13
Trivia: On the plane to Atlantic City, the team is discussing their favorite Mob movie, and Rossi mentions that he's not a fan of them. Joe Mantegna, who plays Rossi, played a mobster in The Godfather Part III and, more famously, is the voice of Mob boss Fat Tony in The Simpsons.
Chosen answer: Back in Target Rich, a hitman named Giuseppe Montolo dies whilst being interrogated by Derek. The men who abducted Derek were hired by his father, Chazz, who seems to blame Derek for his son's death. It's explained further in A Beautiful Disaster.
Annabel Keeley