Ed Asner was hospitalized for exhaustion Tuesday night in Gary, Ind., after struggling with disorientation during his one-man show, "FDR."
The 83-year-old actor, who has been touring the country with the show for 3½ years, had led an acting class at another location hours before the show, according to the Chicago Sun-Times.
The show started 45 minutes late, the paper said, and Asner struggled with lines from the beginning. He was reportedly walked off stage by emergency medical personnel about 15 minutes into the performance. An audience member told the Sun-Times that Asner apologized before leaving the stage and said he'd return when he could.
A Thursday show planned for Ohio was canceled, according to the Greenville Sun. The venue in Ohio said Asner was unable to travel to the show, and that it anticipated a rescheduled performance at a later date.
"What I can say is that it was not a stroke," Asner's son Matt told TMZ. "That much we do know." The actor had been feeling "under the weather" for a few weeks prior, he said.
The "Mary Tyler Moore Show" and "Lou Grant" star was expected to be released later Wednesday, his publicist said.
The Associated Press contributed to this report.