Magnum P.I. ? Sorry that was the 80's, the most likely answer is; Jason King (ITV 1971-2) played by Peter Wyngarde If Columbo was sartorially challenged then Jason King was very much the man about town. Peter Wyngarde's smooth ladies man was a successful author (crime novels about Mark Caine) who solved crimes almost as a hobby, the books paying for his champagne lifestyle. Previously seen in Department S, King was so flamboyant a character he almost demanded his own series. Whilst the series had panache, the leading man was seen as an ageing playboy with a decadent approach which felt out of place in the sober early seventies. Escapist stuff and no more...
Kojak
Yes it was based on a Newark police detective by the name of David Toma
Barnaby Jones Brian Burdick
Laevitin
He was the head detective on a bbc television show called "waking the dead."
dinosaur king is a cool tv show that plays on ch5 at 9:00 enjoy!
in the house for oodles
Inside Detective - 1950 Last Show was released on: USA: 26 December 1954
moonlighting
Columbo
Detective Provado is a mystery television show which began in the year 2007. Some of the main characters of Detective Provado are Paty Onate and Andres Reyes. Yazmin Castaneda is another main character on the show.
Dragnet later know as Badge 714.
its cool for all kids who likes the show
Nero Wolfe
Kojak
The Red Skelton Show - 1951 The Private Detective - 20.4 was released on: USA: 5 October 1970
The TV series was Rocky King. He was a detective that wore a long trench coat (pre Columbo era). If I recall ,he always ended the show with a reference to his wife Mabel...