Brian Blessed has withdrawn from a production of Shakepeare's King Lear, a week after collapsing on stage.
The English actor, known for his booming voice, is playing the lead role in the production.
After he collapsed last week, he initially decided to continue with the show, but has since stepped down in light of medical advice.
He will be replaced in the role by fellow veteran actor Terence Wilton.
Blessed's agent said the actor's heart condition is "more serious than he was aware".