Never repeat the name of his killer. Doing so would only give his killer the fame and notoriety he was seeking. If you must know, look at any newspaper during the days immediately following December 8, 1980. Some visitors to Bagism have claimed getting responses from Yoko when using that address, while others have not. I do not have a phone number or email address for her.
Artists are funny that way.
The 'Gunpowder Plot' was foiled before it could be carried out. Every year on November 5th, the British celebrate 'Guy Fawkes Day' by lighting bonfires, shooting fireworks, and burning effigies of Guy Fawkes. See the excellent site Guy Fawkes - Treason in 1605 for more information. No self-respecting Beatles fan should be without a Beatlefest catalog within arms reach at all times. It is just jam-packed with Beatles goodies of all sorts.