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Roger Lawrence Ewing (January 12, 1942 – December 18, 2025) was an American film and television actor. He is perhaps best known for playing Thad Greenwood in the American western television series Gunsmoke.
Ewing's first screen appearance was in 1964, in the film Ensign Pulver.
In 1965, Ewing guest-starred in the western television series Gunsmoke, appearing in the episode "Song for Dying". Ewing's performance impressed the producers, who offered him the role of Clayton Thaddeus "Thad" Greenwood, and he joined the regular cast. At the time, there was a contract dispute between star James Arness and CBS, and Ewing's character was created by CBS with a view to replacing Arness should they deem it necessary. By 1967 the disagreement had been resolved, and Ewing's character was written out of the show. Ewing had been a Gunsmoke fan while in high school, where he had appeared in a parody of the show.
He also guest-starred in television programs including Rawhide, The Farmer's Daughter, Bewitched, The Eleventh Hour and Room 222.
Ewing retired from acting in 1972, last appearing in the film Play It as It Lays, and became a professional photographer.
Ewing died in Morro Bay, California on December 18, 2025, at the age of 83.
| + !Year !Title !Role !Notes | |||
| 1964 | Ensign Pulver | Jackson | Uncredited |
| 1965 | None but the Brave | Pvt. Swensholm | |
| 1969 | Smith! | Donald Maxwell | |
| 1972 | Play It as It Lays | Nelson |
| 1964 | Bewitched | Marvin "Monster" Grogan | Episode: "The Girl Reporter" |
| 1964 | The Baileys of Balboa | Norman | Episode: "Look Who's a Sailor" |
| 1964 | The Bing Crosby Show | Eddie Fox | 2 episodes |
| 1965 | Rawhide | Billy Wallace | Episode: "The Calf Women" |
| 1965–1967 | Gunsmoke | Various roles | 65 episodes |
| 1967 | The Mothers-in-Law | Carter Case | Episode: "Divorce: Mother-in-Law Style" |
| 1970 | Death Valley Days | Frank Harris | Episode: "Pioneer Pluck" |
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