Yoko Ono urges gun control on 40th anniversary of John Lennon's death

John Lennon's widow Yoko Ono on Tuesday marked the 40th anniversary of the legendary musician's shock murder with a call for gun control.

"The death of a loved one is a hollowing experience," tweeted the 87-year-old artist, who still lives in the Dakota building in Manhattan outside of which her husband was shot four decades ago.