Ed Asner was rushed to the hospital on Tuesday, March 12 during a performance of his one-man show in Gary, Ind. The 83-year-old actor, known for his role as curmudgeonly boss Lou Grant on The Mary Tyler Moore Show, is being treated for exhaustion, The Associated Press reports.

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Asner's publicist Charles Sherman tells the AP that the beloved TV actor was transported by ambulance to a Chicago-area hospital after being taken off stage at the Marquette Pavilion. He is now "resting comfortably" and expected to be released Wednesday.

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Asner has been touring the nation for over three years portraying President Franklin Delano Roosevelt in his one-man show, FDR. His son, Matt, told TMZ Wednesday, "My dad is doing fine. He was rushed to the hospital yesterday for being disoriented on stage." 

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Matt told TMZ that his father did not have a stroke and had been "feeling under the weather for a few weeks."

He added, "He is resting now at an Indiana hospital and is doing well and very grumpy, which with him is always a good thing."

This article originally appeared on Usmagazine.com: Ed Asner Hospitalized: Mary Tyler Moore Actor Treated for Exhaustion After One-Man Show