Despite being a success on radio, Mr. District Attorney couldn't find a big enough audience in two tries at television.
The first series aired on ABC in 1951 and lasted 1 season. Two years after that series ended, Mr. District Attorney returned, with David Brian starring as DA Paul Garrett. Unfortunately, this series also lasted one year. Why? Simple. Television was more flooded with crime dramas at the time than radio was, if you can believe it.
Doug Quick offers a sample clip:
As they say on these shows, that isn't much to go on, but no complete episodes of either TV series are available. Servicable, cookie cutter fare, not much more.