April 3, 1939: On this day NBC presented Mr. District Attorney for the first time. The serial was about a 'champion of the people'. Originally, Mr. District Attorney was a 15 minute nightly program, but in June 1939 it was lengthened to a half hour weekly program and lasted until 1952. Mr. District Attorney was a popular radio crime series that aired on NBC until June 13, 1952. The District Attorney, who was not given a name, was portrayed by many different actors, including Dwight West, Raymond Edward Johnson, Jay Jostyn, and David Bryan. The series was written and created by Ed Byron, a former law student who made use of different criminology texts, statistics, and newspapers to produce a highly-accurate story line and script.