Detectives hunting a rapist who attacked a woman in an alley by Manchester Town Hall hope an appeal on Crimewatch will trace her attacker.
The victim, 20, had been on a night out with friends and was on her way to meet her boyfriend when she was attacked at 0205 GMT on 31 October last year.
"I was screaming for my boyfriend because I knew he was round the corner but he wasn't there and nobody was doing anything," she said.
"When you can't breathe, it's awful."
The woman, who cannot be identified for legal reasons, said she had lost her trust in people and looked at men wondering if they were her attacker.
Her boyfriend said he would have to live for the rest of his life knowing he was not able to protect her.
CCTV footage shows a man following the woman into Library Walk, which runs between the town hall and central library, minutes before she was attacked.
Police want to trace the man, who was white, aged 20 to 30 with short hair.
He had a medium to athletic build and was wearing a light top and jeans.
Officers also believe another woman may have been approached in the same location at about 0200 GMT and attacked. They want her to get in touch with them.
Det Con John Armitage of Greater Manchester Police, said: "I would appeal to anybody who was out in the early hours of that morning who may have seen anyone acting suspiciously in the area to contact us.
"I would also urge the other woman who may have been attacked to come forward."
A reconstruction of the incident will feature in Crimewatch on Monday, 28 February at 2100 GMT on BBC One.
- 31 October 2010