Fox assigned Mature to "Three Little Girls in Blue". He was pulled off that film to play Philip Marlowe in an adaptation of "The High Window". In December 1945 he signed a new two year contract with Fox. However Mature ended up withdrawing from that film and instead was cast by John Ford in "My Darling Clementine", playing Doc Holliday opposite Henry Fonda's Wyatt Earp. The film was produced by 20th Century Fox, whose head of production Darryl F. Zanuck was delighted that Ford wanted to use Mature, telling the director: