03/13/2013 AT 01:00 PM EDT
Mary Tyler Moore
show star Ed Asner is recovering in the hospital after cutting short a one-man show in Indiana when he struggled to deliver his lines and appeared to be confused.
The 83-year-old actor was taken by ambulance to a Chicago-area hospital for exhaustion and was "resting comfortably" on Wednesday, his publicist Charles Sherman tells the Associated Press.
After conducting an acting workshop on Tuesday, Asner took the stage 45 minutes late at the Marquette Pavilion in Gary, Ind., to portray Franklin Delano Roosevelt in the sold-out show FDR.
He struggled with his lines and appeared frustrated but was still conscious as he left the stage, apologizing to the audience and promising to return, the Post-Tribune reports
Asner's health problems arose soon after his Mary Tyler Moore
costar Valerie Harper, 73, revealed to PEOPLE
she has terminal brain cancer.