David Doyle was an American actor best known for his role as Joe Mannix in the television series Mannix, which aired from 1967 to 1975. He was born on February 7, 1929, in Chicago, Illinois, and had a successful career in both film and television. Doyle's distinctive voice and engaging presence made him a recognizable figure in the entertainment industry. In addition to his work on Mannix, David Doyle gained popularity for voicing the character Charlie in the animated series The Charlie Brown and Snoopy Show. He also appeared in various films and guest roles on television shows throughout his career. Doyle passed away on February 26, 1997, leaving behind a legacy in acting.