We saw many celebrities turning up to support the the rally organized by survivors of the Parkland Marjory Stoneman Douglas High School, March for Our Lives today, from Amal and George Clooney to Kim Kardashian and Kanye West. While all of them undoubtedly had their reasons for being there, the march hit super close to home for Sir Paul McCartney, who revealed that he was attending in honor of late friend and bandmate, John Lennon.

Donning a t-shirt emblazoned with the words, “We can end gun violence,” the music legend took time out for an interview with CNN, saying that while he didn’t know exactly how the march would affect future legislature, “this is what we can do, and so, I’m here to do it.”

He went on to reference Lennon’s death, telling “One of my best friends was killed in gun violence right around here, so it’s important to me. ”

Lennon was killed in December of 1980 at the hands of Mark David Chapman, who shot the musician four times in the arch of his doorway. He later told a parole board that he killed Lennon to get attention.

Though the Beatles had broken up 10 years prior to Lennon’s death, McCartney was reportedly devastated by the news, saying, “I can’t tell you how much it hurts to lose him. His death is a bitter, cruel blow — I loved that guy.”

What do you think of Paul’s powerful gesture? Share over @BritandCo.

(Photos via Eduardo Munoz Alvarez, Spencer Platt, + GAB Archrives/Redfern /Getty)