John Meston and refined the main characters who would populate his and Macdonnell's radio portrayal of Dodge. Jeff Spain soon became United States Marshal Matt Dillon, and veteran voice actor William Conrad was chosen by Meston, Macdonnell, and two other network audition judges to be the lawman and the series' central figure. Other seasoned actors filled the needed regular supporting roles, including Parley Baer as Marshal Dillon's trusty assistant Chester Proudfoot, Howard McNear as Dr. Charles "Doc" Adams, and Georgia Ellis, whose role in the series' early episodes would quickly evolve into the saloon "hostess" Kitty Russell. "Gunsmoke" was broadcast for the
Gunsmoke chief, Hubell Robinson, to develop a hardboiled Western series, a show about a "Philip Marlowe of the Old West". Robinson instructed his West Coast CBS Vice President, Harry Ackerman, who had developed the "Philip Marlowe" series, to take on the task. Ackerman and his scriptwriters, Mort Fine and David Friedkin, created an audition script called "Mark Dillon Goes to Gouge Eye" based on one of their Michael Shayne radio scripts, "The Crooked Wheel". Two auditions were created in 1949. The first was very much like a hardboiled detective series and starred Michael Rye (credited as Rye Billsbury) as Dillon; the