Sources:

I'm Shot! The True Crime Story Of John Lennon’s Murder

youtube.com

The Murder of John Lennon | STUFF YOU SHOULD KNOW

youtube.com

Murder of John Lennon

en.wikipedia.org

Mark David Chapman

wikipedia.org

Mark David Chapman | Biography & Facts | Britannica

britannica.com

John Lennon's killer Mark David Chapman's startling confession leaves fans of The Beatles legend further shocked

economictimes.com

Mark David Chapman

nytimes.com