Quinn, a sex offender, was found guilty of attacking the victim – a young mother – as she walked home through Salford in the early hours of the morning on 19 July 2003.
She was beaten, bitten and her cheekbone was fractured. Quinn then strangled her unconscious and raped her.
Jurors at Manchester Crown Court heard that DNA from Quinn’s saliva was found on a vest the victim was wearing on the night.
His DNA was also recovered in 2023 from a medical instrument used to examine the victim, which had never been tested before. He had also searched online to see how long police kept such samples.
Quinn will be sentenced on 5 June.
DC Jim Partington said GMP is looking at unsolved cases from the past, which Quinn might have been involved in given the extreme violence he exerted in this case.
“I think the likelihood is there probably are other victims,” said Partington. He then added: “There’s three crimes, ranging I think from 2003 to 2010, that have been looked at in detail now… there’s not really any definitive link but we certainly are re-reviewing local crimes.”
GMP have appealed for people who may have come into contact with Quinn to come forward with any information they might have.