Lee Harvey Owsald acted alone in assassinating Kennedy.
Step-by-step explanation:
The Warren Commission, under Chief Justice Warren was set up to investigate the assassination of President John F Kennedy in Dallas on November 22nd 1963.
It concluded that Lee Harvey Oswald, who himself was shot dead by Jack Ruby before he was brought to trial, was solely responsible and acted alone.
The findings raised as many questions as it answered and to this day there have been countless conspiracy theories.