In a show of support for gun control, Yoko Ono yesterday tweeted a photograph of the bloodied glasses her late husband John Lennon wore the day he was murdered. Accompanying the photo was the message: "Over 1,057,000 people have been killed by guns in the USA since John Lennon was shot and killed on 8 Dec 1980."

An activist for many causes – most recently drumming up support to stop fracking in New York – Ono turned her attention to gun violence with a series of tweets that all included the image, which she also used on the cover of her 1981 album Season of Glass.

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Another tweet read, "31,537 people are killed by guns in the USA every year. We are turning this beautiful country into a war zone." And, more personally, "The death of a loved one is a hollowing experience. After 33 years our son Sean and I still miss him."

Yesterday also marked the 44th anniversary of Ono and Lennon's wedding. In honor of the anniversary, Ono also tweeted, "We decided that if we were going to do anything like get married that we would dedicate it to peace," along with a link to her site ImaginePeace.com. There she had posted a few photos from their wedding along with a 1971 interview the two gave to Rolling Stone, in which the couple talk about protesting for peace.

"We think that peace is only got by peaceful methods and that to fight the establishment with their own weapons is no good, because they always win and they’d been winning for thousands of years," Lennon says in the clip. "They know how to play the game 'violence' and it's easier for them when they can recognize you and shoot you. They don't know how to handle humor, and peaceful humor. And that's our message really."

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This article originally appeared on Rolling Stone: Yoko Ono Tweets Photo of John Lennon's Bloody Glasses in Plea for Gun Control