Indian billionaire Sunjay Kapur, 53, died on Thursday, June 12, after being stung in the mouth by a bee while playing in a polo match at the Guards Polo Club in Windsor, England. (AP Photo/Rebecca Blackwell) AP

Sources close to the family and eyewitnesses believe the likely cause of the death was a massive heart attack.

Mr. Kapur, who died of a heart attack after playing in a polo match in England, was formerly married to the Bollywood star Karisma Kapoor.