On this day in 1963, Dallas nightclub owner Jacob Rubenstein (a.k.a. Jack Ruby), an ardent admirer of the late John F. Kennedy, committed suicide by jumping to his death from the sixth floor of a school book depository in Dealey Plaza. Rubenstein had been psychologically shattered by the news of Kennedy's death the previous day; the Dallas police officer who found Rubenstein's body, J.D. Tippit, would later receive a commendation for his work in the Rubenstein suicide investigation and would eventually become head of the Dallas Police Department homicide squad before retiring in 1986 after a distinguished 34-year career in law enforcement.