August 6, 1930 Judge Joseph Force Crater, whose disappearance was unsolved for many decades until 2005 when a handwritten letter by Stella Ferrucci-Good in an envelope marked "Do not open until I die." was discovered and opened by her granddaughter revealing a twisted tale involving Murder Incorporated, though never confirmed neither has there been evidence to debunk the bizarre story.
https://en.m.wikipedia.org/wiki/Joseph_Force_Crater