KGB thought LBJ was in on the assassination. https://imgur.com/2W3lQZu
EDIT: Johnson again accused of being involved: https://www.archives.gov/files/research/jfk/releases/docid-32139804.pdf
Oswald was CIA and no one cares https://imgur.com/B8tgdYJ
Second shooter confirmed: https://imgur.com/jQxWEEQ
Possibly speaking about the assassination 17 days before it happened? https://www.archives.gov/files/research/jfk/releases/docid-32275504.pdf
Soviets reaction to the assassination, even they felt it wasn't one gunman: https://www.archives.gov/files/research/jfk/releases/docid-32204484.pdf
JD Tippit is a possible killer of JFK https://www.archives.gov/files/research/jfk/releases/docid-32170661.pdf
EDIT: Ruby, Oswald and Tippit possibly met in Ruby's nightclub a week before the assassination.
Only two organizations knew the Kennedy parade route, the Secret Service and the Dallas police. Ruby was in the police circle and urged Oswald to take a job at the Texas Schoolbook Depository. https://www.archives.gov/files/research/jfk/releases/docid-32144493.pdf
EDIT: It is likely two people were involved in the shooting. The other being Officer JD Tippit.
EDIT: One bullet was shot from a bridge across the parkway in front of Kennedys motorcade according to the Surgeon Generals report.
EDIT: Bullet hole in the windshield of the presidents car?