A housekeeper called authorities at 10:20 a.m. after finding Spade -- whose real name was Kate Brosnahan -- at her Park Avenue apartment.
She apparently left a note, according to several reports.
The Kansas City-born entrepreneur teamed up with Andy Spade, creating a company that exploded in the 1990s, establishing 175 retail stores around the world -- including 140 in the U.S.
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