In 1940, 34-year-old Abe Reles had already been arrested 42 times and served six prison terms. In jail for murder, he decided to turn informant. As a member of Murder Inc., a crime syndicate specializing in contract killing, Reles was able to provide details on 70 known unsolved murders, as well as hundreds more.
Reles and the other informants in the case were under 24-hour police protection waiting to testify when he fell to his death from the window of his room.
Whether Reles jumped or was pushed is unknown to this day, but his fall led to his post-mortem nickname of "The Canary Who Could Sing but Couldn't Fly."