Police say they have started making fresh inquiries into the death of Samantha Novak, daughter of singer Dame Shirley Bassey.
Samantha was believed to have died accidentally in 1985 after being found face down in the River Avon, near Bristol.
But fresh evidence has emerged to suggest convicted killer Michael Moffat, currently in jail for the murder of his lover Penny Beale, may have been involved.
Penny's mother has written to police with information that alleges a link between Moffat and Samantha's death.
Singer Shirley, who also has an elder daughter and adopted son, has always claimed her 21-year-old daughter's death was neither accidental nor suicide.