Why did Radar leave MASH? Decades later, Burghoff insists he never actually left
Gary Burghoff was the only actor from Robert Altman's 1970 MASH to reprise his role for the CBS series, and he played Cpl. Walter "Radar" O'Reilly for seven seasons. Then Klinger got the clerk's desk and Radar went home to Iowa.
The standard explanation is burnout. Burghoff's own version, given decades later on national television, is more of a technicality.
The short answer
Burghoff stopped after season 7 in 1979, citing exhaustion after seven years and a family life he'd stopped showing up for. He came back the following season to shoot the two-part "Good-Bye Radar," which aired October 8 and 15, 1979 as episodes 4 and 5 of season 8. He appeared in four season 8 episodes total, then was gone for good.
"I didn't leave the show"
Speaking in the Fox special MAS*H: The Comedy That Changed Television, broadcast January 1, 2024, Burghoff pushed back on the framing of the question — one he said people had been asking him for 30 years:
"I didn't leave the show; my contract expired," he said.
He explained that he had a seven-year contract and simply didn't renegotiate, because he was pulling back from everything at once. In the same period he described his life as a beautiful picture hanging crooked. His marriage ended after he left the show.
He had also described the specific problem in blunter terms: for seven years, no new person he met called him Gary. They called him Radar. He once said he knew it was time when he heard a plane overhead while sitting by his pool and instinctively froze, the way the character does.
How the writers got him out
In the story, Radar's uncle dies and his mother can't run the family farm alone, so he takes a hardship discharge. Klinger inherits the company clerk job and the sock puppet chaos that comes with it. The wounded arrive mid-farewell party, so Radar never gets his goodbye scene with Hawkeye — he salutes an empty OR instead.
Worth noting: "Good-Bye Radar" was originally shot as the season 7 finale. CBS held it back and expanded it into a two-parter for the November sweeps.
The scene he asked to shoot twice
Burghoff played the final moment in tears. The director advised him to fight them. He ignored the advice, watched the dailies the next day, decided it was terrible, and asked executive producer Burt Metcalfe for another take. He got it. Director Charles S. Dubin later told the Television Academy Foundation that Burghoff broke down during the goodbye material badly enough that production stopped for 15 minutes.
Fun fact: Burghoff was nominated for six Emmys as Radar and won in 1977, with Alan Alda accepting on his behalf.
Radar's teddy bear outlasted him — Hawkeye put it in a time capsule in the show's penultimate episode.