Also Known As:
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- Amantes sanguinarios
- Dear Martha
- I killers della luna di miele
- Kuherruskuukausimurhaajat
- Les tueurs de la lune de miel
- Los asesinos de la luna de miel
- Lua de Mel de Assassinos
- Paranoikoi dolofonoi
- The Honeymoon Killers
- The Lonely Hearts Killers
- Leonard Kastle
- Donald Volkman
- Leonard Kastle
- Shirley Stoler ... Martha Beck
- Tony Lo Bianco ... Raymond 'Ray' Fernandez
- Mary Jane Higby ... Janet Fay
- Doris Roberts ... Bunny
- Kip McArdle ... Delphine Downing
- Marilyn Chris ... Myrtle Young
- Dortha Duckworth ... Mrs. Beck - Martha's Mother
- Barbara Cason ... Evelyn Long
- Ann Harris ... Doris
- Mary Breen ... Rainelle Downing
- Elsa Raven ... Matron
- Mary Engel ... Lucy
- Guy Sorel ... Mr. Dranoff
- Michael Haley ... Jackson (as Mike Haley)
- Diane Asselin ... Severns
- William Adams ... Justice of the Peace (as Col. William Adams)
- Eleanor Adams ... Mrs. Hand
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