Roger Ewing - wikipedia Roger Ewing Roger Ewing ( 1942 - 01 - 12 ) January 12, 1942 ( age 76 ) Los Angeles, California, U.S. Nationality American Occupation Actor ; Photographer Years active 1964 -- 1972 ( as actor ) Height 6'4 '' Roger Ewing ( born January 12, 1942 ) is a former actor originally from Los Angeles, California. Contents 1 Biography 2 Other roles 3 Partial filmography 4 References Biography Ewing is best remembered for his characterization of part - time deputy marshal Clayton Thaddeus `` Thad '' Greenwood in thirty - six episodes ( October 2, 1965 - September 25, 1967 ) of the long - running CBS western television series Gunsmoke with James Arness. In his first episode `` Clayton Thaddeus Greenwood '', Ewing 's character arrives in Dodge City, Kansas, the location of the series, from Oklahoma with a warrant he is unable to execute. Among Ewing 's last Gunsmoke appearances were on episodes entitled `` The Prodigal '', `` Nitro '' ( Parts 1 and 2 ), `` Ladies from St. Louis '' and `` Mistaken Identity ''. Before he was cast as Thad, Ewing appeared on Gunsmoke once in the role of Ben Lukens in the episode `` Song for Dying '', which aired on February 13, 1965. Other roles Ewing 's first television appearance was in 1964 as Marvin Grogan on ABC 's sitcom Bewitched in the episode `` The Girl Reporter ''. He also appeared that season as Eddie Fox in the episode `` The Christmas Show '' of ABC 's short - lived The Bing Crosby Show, starring Bing Crosby and Beverly Garland, and in a third sitcom as well in the role of Norman in the episode entitled `` Look Who 's a Sailor '' on CBS 's short - lived The Baileys of Balboa. In 1965, Ewing, at twenty - three, appeared as Private Swensholm in the World War II film None but the Brave starring Frank Sinatra and Clint Walker. That same year, he appeared as Billy Wallace in the episode `` The Calf Women '' of CBS 's western Rawhide starring Eric Fleming and Clint Eastwood. After his Gunsmoke role ended, Ewing appeared in two films : as Donald Maxwell in the western production Smith ! starring Glenn Ford ( 1969 ) and as Nelson in Play It As It Lays, a psychiatric drama starring Tuesday Weld and Anthony Perkins ( 1972 ). Also in 1969, Ewing was a celebrity contestant on an episode of The Dating Game in which the eligible bachelorette was future actress Lindsay Wagner. He also made a guest starring appearance on the sitcom The Mothers - in - Law as a wealthy former boyfriend of the character played by Deborah Walley. Ewing 's Gunsmoke character was superseded by that of Newly O'Brien, portrayed by Buck Taylor, son of character actor Dub Taylor. After his acting career ended, Ewing returned to his previous work as a photographer. Los Angeles portal California portal Television portal Film portal Photography portal Partial filmography Ensign Pulver ( 1964 ) - Jackson ( uncredited ) None but the Brave ( 1965 ) - Pvt. Swensholm Smith ! ( 1969 ) - Donald Maxwell Play It As It Lays ( 1972 ) - Nelson ( final film role ) References Jump up ^ `` Roger Ewing Summary ''. tv.com. Retrieved January 7, 2009. ^ Jump up to : `` Roger Ewing ''. www.imdb.com. Retrieved January 7, 2009. Jump up ^ `` Gunsmoke : Television Cast Member Info ''. uark.edu. Retrieved January 7, 2009. Jump up ^ `` James Arness : Greetings from Jim '', May 2002 ``. jamesarness.com. Retrieved January 7, 2009. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Roger_Ewing&oldid=814566053 '' Categories : 1942 births Male actors from Los Angeles American male television actors American male film actors American photographers Living people Western ( genre ) television actors Hidden categories : Articles with hCards Talk Contents About Wikipedia Add links This page was last edited on 9 December 2017, at 16 : 08. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: who played the role of thad on gunsmoke
Answer: Ewing