Why debate endures
Physical evidence and competing conclusions
Investigators recovered cartridge cases and a Mannlicher-Carcano rifle on the sixth floor of the Texas School Book Depository, making the Depository the central physical anchor of the official case against Oswald.
The Warren Commission formally concluded that Lee Harvey Oswald acted alone in killing President Kennedy and that Jack Ruby acted alone in killing Oswald.
The House Select Committee on Assassinations concluded in 1979 that Kennedy was probably assassinated as the result of a conspiracy, even while agreeing that Oswald fired shots from the Depository.
Later scientific reviews rejected the reliability of the dictabelt acoustic evidence that had helped HSCA infer a probable conspiracy.

