Star of books, radio, & movies, Jack Boyle's Boston Blackie transitioned to television in 1951, with Kent Taylor in the lead role. Blackie, nee Horatio Black, is a reformed jewel thief who now is a private eye, but, much like Jim Rockford 2 decades later, often finds his criminal past comes back to work against him on some cases.
58 episodes were produced by Ziv over two years (1951-3), and some have found their way to DVD via public domain, like this one, "Cop Killer".
Boston Blackie has found new life, albeit in comic books, in recent years. Moonstone Publishing has released a pair of graphic novels, reintroducing Blackie to a new generation.