Cannon
Cannon is a CBS detective television show produced by Quinn Martin which aired from March 26, 1971. The main protagonist would be your title character, personal detective Frank Cannon, played by William Conrad. In addition, he appeared on two episodes of Barnaby Jones.
Cannon is your Quinn Martin-produced series to be aired on a system other than ABC. A"resurrection" television film, The Return of Frank Cannon, was aired on November 1, 1980. In total, there were 124 episodes.