Once the Killing Starts
- År: 1974
- Land: United Kingdom
- Genre: TV film, Mysterium, Drama, Thriller, Gyser
- Studio: Associated Television (ATV)
- Nøgleord: murder, affair
- Direktør: John Scholz-Conway
- Cast: Patrick O'Neal, Angharad Rees, Michael Kitchen, Gerald Sim, Gary Watson, Patricia Donahue