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He was 86.
Sources told the Post that Wilson, who left a note before jumping at 11:00 a.m. on Monday, suffered a stroke a few months prior.
Wilson was relatively low profile, but amassed an $800 million fortune by the year 2000, which he then proceeded to donate away (especially to environmental and conservation efforts). He had started his firm, Wilson Associates, with $15,000.
Friends of Wilson told the post it was his ambition to give away most of his wealth before he died, but he still had about $100 million to go.