I have it on VERY good authority (from a woman who was very active in the industry and still is to a lesser extent now) that Prince was a voracious consumer of cocaine back in the old days. Amounts that would kill normal people. It’s likely the guy had a very bad heart and at best he could have had a heart attack. At worst it could have been an overdose.
Much like his former love interest, Denise ‘Vanity’ Matthews. She was 57 and died 2 months ago of kidney fåilure.