The LIFE Picture Collection/Getty ImagesToday of course marks one of the most tragic days in rock history. Thirty-six years ago, John Lennon was murdered by Mark David Chapman outside of The Dakota, the New York City apartment building in which Lennon lived with his wife, Yoko Ono.

As she’s done many times before, Yoko’s using the anniversary of her husband’s murder to call attention to gun violence in America. Wednesday night, she tweeted the now-familiar image of the bloodied glasses Lennon was wearing when he was killed.

Together let’s bring back America the green land of Peace
The death of a loved one is a hollowing experience
After 36yrs we still miss him pic.twitter.com/nRvdFKixW2

— Yoko Ono (@yokoono) December 8, 2016

“Over 1,200,000 people have been killed by guns in the U.S.A. since John Lennon was shot and killed on December 8, 1980,” reads the message on the image.

Along with the image, Yoko tweeted the message, “Together let’s bring back America the green land of Peace. The death of a loved one is a hollowing experience. After 36yrs we still miss him.”

John Lennon had just turned 40 the previous October when he was murdered. Chapman, now 69, pleaded guilty to killing Lennon and is serving life in prison for the crime.

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