Yoko Ono has called for the anniversary of John Lennon's death to be "a day of worldwide healing".
Ono placed a full page ad in The New York Times on November 26 in which she urged fans to mark the anniversary by apologising to those who have suffered because of violence and war.
In the letter, dedicated to victims , she wrote: "Every year let's make December 8 the day to ask for forgiveness from those who suffered the insufferable.
"Know that the physical and mental abuse you have endured will have a lingering effect on our society... Know that the burden is ours."
The singer and artist, who signed the letter Yoko Ono Lennon, mentioned the way she dealt with murder of John Lennon on December 8, 1980, she said: "I don't know if I am ready yet to forgive the one who pulled the trigger...but healing is what is urgently needed now in the world.
"Let's wish strongly that one day we will be able to say that we healed ourselves and by healing ourselves we healed the world."
Lennon was shot outside his New York apartment by Mark Chapman, who is currently serving a 20 years to life sentence in prison.