- Dates: September 14, 1971 - March 3, 1976
- Type: Television Series
Some time before the events of the debut episode, Frank Cannon was a detective with the Los Angeles police department. However, he resigned after the deaths of his wife and son in a car accident and later became a private detective. The cause of death of Cannon's wife and child is not clear. In one of the later season it is mentioned that Cannon's wife and child were killed in an explosion caused by a bomb meant for Cannon. Although the noticeably overweight Frank Cannon had expensive tastes, especially in food and cars (his primary vehicle was a silver '71 Lincoln Continental Mark III), he also felt there was a need for someone to help people who had little or no money. For this reason, he charged his more affluent clients hefty fees so he could aid the less affluent.