John Lennon was killed in December 1980 when Mark David Chapman shot him four times in the archway of upscale apartment complex The Dakota in Manhattan.
Paul McCartney tried to imagine a world without gun violence - while standing just steps away from the spot where his former band mate John Lennon was murdered.
'One of my best friends was killed in gun violence right around here, so it's important to me, ' McCartney told CNN.
He added he was unsure if gun violence can be ended, adding: "But this is what we can do, so I'm here to do it".
McCartney was one of many musicians and performers who publicly voiced their support for March for Our Lives on Saturday. "But this is what we can do, so I'm here to do it".
Paul McCartney was among those who took a participation in the nationwide March For Our Lives on Saturday after deadly mass shooting at Stoneman Douglas High School that left 17 dead.
In total, over 800 March For Our Lives events took place over the weekend.