A sex attacker who raped a teenage waitress at knifepoint more than 20 years ago is facing jail.
Andrew Riley was 16 when he and an accomplice offered a lift to their 19-year-old victim in Stockwell, south London.
Riley, of Canning Town, east London, pleaded guilty to rape when he appeared at the Old Bailey on Friday.
He was remanded in custody and will be sentenced at Woolwich Crown Court on 25 March.
Judge Peter Rook warned Riley he could be facing a "substantial sentence of imprisonment".
The court heard how the two boys both raped the teenager while driving her around in a car during a three-hour ordeal.
The girl escaped by saying that she needed to go to the toilet.
The victim fled to a house where residents alerted police but neither of her attackers could be identified after the attack, in September 1988.
Since then, Riley, now 39, has been convicted of an indecent assault and a number of offences of dishonesty.
The DNA database allowed officers conducting a cold case review to find him.
The second assailant has never been identified.
The judge told him: "Rape is always a very serious offence and this was a particularly serious example.
"There is only one sentence I can pass and that will be a substantial sentence of imprisonment."