The mother of murdered estate agent Suzy Lamplugh has died.
Personal safety campaigner Diana Lamplugh, 75, died in her sleep in a London hospital after suffering a stroke.
She set up the Suzy Lamplugh Trust after her 25-year-old daughter disappeared in 1986, having left her west London offices to meet a client.
Mrs Lamplugh campaigned on issues ranging from making minicabs safer to protecting victims of stalking.
Paul Infield, chairman of the Suzy Lamplugh Trust's board of trustees, said: "Diana was one of those people who contributed energy, focus and commitment to everything she did.
Battle with Alzheimer's
"With her husband Paul, she was tireless in establishing, through the trust, the concept of and discipline for personal safety - now a household expression - as a positive life skill for people of all ages and occupations."
Mrs Lamplugh, who was appointed an OBE in 1992, first suffered a stroke in 2003 and then had a nine-year battle with Alzheimer's.
She leaves her husband Paul, her other children Richard, Tamsin and Lizzie, and her seven grandchildren.
Her daughter Suzie's remains have never been found but she was declared dead, presumed murdered, in 1994.
Officers have examined thousands of lines of inquiry and conducted DNA testing on 800 unidentified bodies.