Detectives have uncovered a DNA profile they believe could identify the killer of a teenager who was raped and beaten to death more than 30 years ago.
Dorothy Leyden's body was found hours after she had been to a Jimmy Ruffin concert in April 1971.
A spokeswoman for Greater Manchester Police said: "Like police, Dorothy's family never given up in the hope that her killer will be brought to justice."
A reconstruction will be featured BBC One's Crimewatch later.
Dorothy's sister, Pat Atkinson, will join officers from Greater Manchester Police's Cold Case Review Unit in the television appeal.
Forensic science developments have led police to look again at evidence found at the time.
Concert souvenir
Dorothy's body was found at the back of the Spread Eagle pub on Rochdale Road in Manchester - now the site of Collyhurst police station.
In her bag was a towel used to mop Jimmy Ruffin's brow which she had managed to catch during the concert.
According to police reports, she and her friends left the concert and caught a taxi on Princess Parkway at 0100 BST which dropped her off in Piccadilly Gardens.
"The past 37 years have been devastating for Dorothy's family, who are desperate to know that the person who killed her is caught and held to account"
However, instead of catching the bus home as planned, she was later spotted walking home in the rain along Rochdale Road.
In the early hours of 25 April a girl was heard screaming close to the Spread Eagle pub and a man was seen running away. Her body was found a few hours later.
Det Supt Martin Bottomley said: "Although it was a long time ago, I would ask people to search their memories for information that could help us trace Dorothy's killers.
"It may help to remember that the night Dorothy was killed was the night of the 1971 census.
"The past 37 years have been devastating for Dorothy's family, who are desperate to know that the person who killed her is caught and held to account.
"I would urge anyone who has any information about this to contact us and help bring this family some peace."
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