Yoko Ono joined the U.S.  gun debate when she tweeted a picture of  the blood-stained glasses her husband, John Lennon, was wearing when he died.

Lennon died in 1980 after being shot in the back four times at the couple’s New York City apartment by a stalker.  The tweets were sent yesterday in commemoration of what would have been her and Lennon’s 44th wedding anniversary.

Ono tweeted the image four times, including different anti-violence reflections each time, saying that guns are making America into a “war zone.”

Yoko urged others to “bring America back” to a “green land of peace.”

Yoko Ono, now 80, concluded her tweets by saying that in the 33 years after Lennon’s death, she and the couple’s son, Sean, who is now 37, still miss him.