Other people really can't control their feelings especially when things like winning the jackpot prize happen since it's a rare experience. Probably most of the gamblers who had a heart attack have a history of heart disease that is why they are more prone to it. It's indeed unfortunate since winning a jackpot is unusual for us to experience yet they cannot celebrate their winning because they died due to extreme emotion. But we can't do anything about it, that's how life works.