Conversation so far:
What started Curly Howard's decline?
Curly Howard's energy began to wane
Was Curly Howard sick when his energy began to wane?
Curly Howard was diagnosed with extreme hypertension, a retinal hemorrhage, and obesity.
Did Curly Howard's health continue to decline after being diagnosed with extreme hypertension, retinal hemorrage and obesity?
In spite of eight weeks' time off in that same period, Howard's condition continued to deteriorate
Was Curly Howard unable to work during the time that his condition continued to deteriorate?
Half-Wits Holiday was Howard's final appearance as an official member of the Stooges.
Did Curly Howard die as a result of his health?
Curly Howard suffered through serious health problems and several more strokes until his death in 1952 at age 48

Question: When did he have to stop acting?
Self-contained rewrite: When did Curly Howard have to stop acting?