Possible Clues:

• 'The Big Sleep' co-star, 1946
• Hepburn co-star in 'The African Queen'
• Actor and actress with hygiene problem first time
• Casablanca star
• Humphrey of "The Big Sleep"
• Bergman's 'Casablanca' co-star
• Marlowe’s portrayer in “The Big Sleep”
• Humphrey __, star of Casablanca
• Filmdom's Sam Spade
• Lauren Bacall's first actor husband, d. 1957