Did John Lennon kill anyone

Answer 1

Not officially.

There is an argument, most strongly advanced in the book "Who Killed JohnLennon?" by English lawyer Fenton Bresler, that the murder was the work of a rogue element of the CIA. Mark David Chapman, who confessed to the murder, is known to have had psychiatric treatment several times and Bresler notes parallels between Chapman's treatment and the experiments on mind control which were carried out under the CIA's MKULTRA programme. Of further interest is Chapman's association with WorldVision which is ostensibly a Christian charitable foundation but it is suspected of being a front for CIA recruitment of assassination teams. Of note in this regard is that WorldVision's refugee camps are believed to be where the CIA recruited Nicaraguans and El Salvadoreans for the Contras and Cubans for the Bay of Pigs operation. Of further interest is that John Hinckley Senior, father of President Reagan's would-be assassin, was the chairman of WorldVision. Like Chapman, Hinckley Junior had worked in WorldVision camps for Thai refugees in the seventies.

Answer 2

No.