Well, to make a long story short, Jack Ruby was Jewish!
Since Jack Ruby's mother was Jewish, and in Judaism one's religion is based on one's mother's religion, then that makes him also Jewish. His father was Jewish too.
Jack Ruby (who's full birth name was Jacob Leon Rubenstein) was born on March 25, 1911 in Chicago, Illinois, United States.
On November 24, 1963, Ruby shot and killed Lee Harvey Oswald who, according to five government investigations, was the sniper who assassinated U.S. President John F. Kennedy on November 22, 1963.
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