A former U.S. Marine who had briefly defected to the Soviet Union, Oswald was initially arrested for the shooting murder of police officer J. D. Tippit, on a Dallas street approximately 40 minutes after Kennedy was shot, at 12:30pm local time. Soon suspected in the assassination of Kennedy as well, Oswald denied involvement in either killing. Two days later, while being transferred from police headquarters to the county jail, Oswald was mortally wounded by nightclub owner Jack Ruby in full view of television cameras broadcasting live.