She was sixteen when President John F. Kennedy was assassinated in Dallas on November 22, 1963. Johnson heard of the assassination while attending a Spanish class at the National Cathedral School. She was unaware whether her father had been injured as well but realized he had been sworn in as the 36th President of the United States when Secret Service agents showed up on her school campus a few hours later. She later attended Georgetown University School of Nursing and Health Studies but dropped out in 1966 as the school prohibited married students (Johnson married her first husband in August 1966).