Short answers, pulled from the story.
The assassination of John F. Kennedy occurred on the 22nd of November 1963, in Dallas, Texas. The motorcade entered Dealey Plaza at 12:30 p.m. CST before multiple shots were fired as the limousine traveled down Elm Street.
The Warren Commission concluded that Lee Harvey Oswald acted alone in killing Kennedy and wounding Governor Connally. The commission also stated that Jack Ruby acted alone in killing Oswald without any conclusions regarding Oswald's motive.
Lee Harvey Oswald used an Italian Carcano M91/38 bolt-action rifle which he had purchased under the alias A. Hidell. FBI investigators found Oswald's partial palm print on the barrel and ballistically matched bullets from this weapon to wounds sustained by Kennedy and Connally.
About 80% of the witnesses recalled hearing three shots during the event. The House Select Committee on Assassinations later concluded there was a high probability that a fourth shot was fired from the grassy knoll but missed Kennedy.
President Kennedy's autopsy was performed at Bethesda Naval Hospital in Maryland on the night of the 22nd of November 1963. Three physicians including naval commanders James Humes and J. Thornton Boswell with assistance from ballistics wound expert Pierre A. Finck conducted the procedure.