I know it`s not the same genre that most like, but it still was a malicious senseless killing of another rock god on the very same day as Lennon. Zakk Wylde wrote the tribute song for Dimebag Darrell. It actually shows the shooting on Youtube but i think it should be pulled off the site myself.
R.I.P Lennon and Dimebag
https://www.youtube.com/watch?v=0X01M73uGZc