Milly's Fund, the charity set up by the family of murdered schoolgirl Milly Dowler, is being wound up and its work taken over by the Suzy Lamplugh Trust.
The two charities have had a close relationship since Milly's Fund was founded three years ago in memory of the teenager, whose body was found six months after she went missing. The case has yet to be solved.
Her mother, Sally Dowler, said: "Setting up the charity gave us a way to harness all the offers of help we received when Milly was missing.
"I had briefly met Diana Lamplugh (Suzy's mother) years before at a course about women's safety and had been very impressed by her.
"After Milly went missing, I felt I'd like to meet her and her husband Paul because I felt an affinity with them."
Paul Lamplugh suggested the Dowlers should concentrate their efforts on personal safety for young people, and the couple went on to make a video aimed at this audience.
Dowler said: "The charity gave us a focus through an unbearably awful time, but we always intended that it would run for a limited period. It's as if a weight has been lifted from our shoulders and we can get on with rebuilding our lives."
Julie Bentley, chief executive of the Suzy Lamplugh Trust, added: "All the assets we receive from Milly's Fund will be ring-fenced for youth work. We are proud to take its work forward."