 Leading man Brian Keith was also Maureen O'Hara's co-star in "The Parent Trap" which they completed immediately before "The Deadly Companions" and which premiered on June 12, 1961, six days after the Tucson premiere of "The Deadly Companions".They re-teamed for one additional film, 1966's "The Rare Breed", which top-billed James Stewart.Cinematographer William H. Clothier also worked on "The Rare Breed" as well as two other films with Maureen O'Hara, 1963's "McLintock!"