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
Matt Dillon (Gunsmoke) provide observations that assisted with character development. Inasmuch as the radio episodes were a bit darker and more violent in nature than the television episodes (especially in the radio series' early years), Conrad's Marshal Dillon could sometimes be quick to anger and unhesitating with respect to taking violent courses of action. Paradoxically, however, Conrad's Dillon often struggled internally with the need to utilize violence in order to fulfill his duties. He also struggled internally with the frequent needless tragedies that his job caused him to witness. These factors were the primary reasons that Conrad's Matt could occasionally become snappish and