Mark David Chapman was sentenced to 20 years to life in prison for murdering John Lennon.
Source
John Lennon and Yoko Ono planted acorns for world peace after also mailing acorns to many world leaders to do the same.
John Lennon had his last professional photoshoot.
Beatlemania arrived in the United States when the Beatles landed in New York.
John Lennon's album 'Walls and Bridges' was released in the US.
John Lennon's most iconic hit, 'Imagine,' was released in the UK.
