A wealthy soon-to-be-widower's blackmail plot comes back to bite him in The Killer Must Kill Again (1975). When George Mainiadri (George Hilton) witnesses a mysterious man (Michel Antoine) dumping a dead body, he doesn't report the incident to the police. No, instead he blackmails the man into murdering his wife Norma (Tere Velázquez) instead. George thinks his plan is foolproof, but then a teenage couple steals his car...with Norma still in the trunk! Now these joyriding juvenile delinquents are being targeted by a homicidal maniac, but luckily for Mr. Skin they're going to get naked first. The Spiller Must Spill Again!