Jack Ruby, the Dallas nightclub owner who killed Lee Harvey Oswald—the accused assassin of President John F. Kennedy—is found guilty of the “murder with malice” of Oswald and sentenced to die in the electric chair. It was the first courtroom verdict to be televised in U.S. history.

On November 24, 1963, two days after Kennedy’s assassination, Lee Harvey Oswald was brought to the basement of the Dallas police headquarters on his way to a more secure county jail. A crowd of police and press with live television cameras rolling gathered to witness his departure. As Oswald came into the room, Jack Ruby emerged from the crowd and fatally wounded him with a single shot from a concealed .38 revolver. Ruby, who was immediately detained, claimed he was distraught over the president’s assassination. Some called him a hero, but he was nonetheless charged with first-degree murder.

Jack Ruby, originally known as Jacob Rubenstein, operated strip joints and dance halls in Dallas and had minor connections to organized crime. He also had a relationship with a number of Dallas policemen, which amounted to various favors in exchange for leniency in their monitoring of his establishments. He features prominently in Kennedy-assassination theories, and many believe he killed Oswald to keep him from revealing a larger conspiracy. In his trial, Ruby denied the allegation and pleaded innocent on the grounds that his great grief over Kennedy’s murder had caused him to suffer “psychomotor epilepsy” and shoot Oswald unconsciously. The jury found him guilty and sentenced him to die.

In October 1966, the Texas Court of Appeals reversed the decision on the grounds of improper admission of testimony and the fact that Ruby could not have received a fair trial in Dallas at the time. In January 1967, while awaiting a new trial to be held in Wichita Falls, Ruby died of lung cancer in a Dallas hospital.

The official Warren Commission report of 1964 concluded that neither Oswald nor Ruby were part of a larger conspiracy, either domestic or international, to assassinate President Kennedy. Despite its seemingly firm conclusions, the report failed to silence conspiracy theories surrounding the event, and in 1978 the House Select Committee on Assassinations concluded in a preliminary report that Kennedy was “probably assassinated as a result of a conspiracy” that may have involved multiple shooters and organized crime. The committee’s findings, as with those of the Warren Commission, continue to be widely disputed.

READ MORE: Why the Public Stopped Believing the Government about JFK’s Murder