Voyeur caught spying on female housemate, 22, by leering through her bedroom window at 2am

This ‘Peeping Tom’ was caught in the act after clambering onto a roof at 2am - to spy on his own housemate through her bedroom window.

Unsuspecting Sam Walton, 22, was watching TV in her bedroom when a neighbour opposite saw the voyeur lying outside her first-floor room pleasuring himself in the dark.

The neighbour shouted and disturbed the pervert who quickly jumped off the roof - only to climb back up and continue with his vile behaviour five minutes later.

The neighbour's mum then stormed round to warn the drama student who found footprints all over the roof outside her window after the creep fled.

And days later horrified Sam discovered she was sharing a house with the man, a foreign student, when the eyewitness called round and recognised him.

But despite calling in police and handing them the damning photographs the suspect was never charged - and was allowed to return to his native country unpunished.

Sam said police told her he was not being prosecuted because of a lack of evidence.

She said: ‘I was just sitting their watching Breaking Bad in my pyjamas and while I heard a noise I didn't think anything of it.

'About 45 minutes I heard a knock at the door, and I answered and there was a middle-aged woman I didn't recognise.

'She asked if I was the girl who lived in the back bedroom on the first floor.

'I told her yes, and she said 'my son has just woken me. There has been a man sitting on the roof outside your bedroom window masturbating.'

'I freaked out. I was afraid whoever was out there might have climbed in through my open window while I answered the door, so I asked the lady to come up with me while I closed it.

'I also noticed footprints on the roof near my window. I arranged a house meeting, and naturally they were worried.

'When I saw the picture and saw how close he was, it made me think he had done it before.'

Sam's boyfriend and parents urged her to immediately leave the student digs in Liverpool after the incident in April but she stayed, determined to catch the culprit.

A few days later her neighbour's son went to check on her and recognised the man in the kitchen where he was sharing the house with Sam and three other students.

Sam noticed his distinctive Adidas trainers matched the footprints on her roof.

She said the man - a foreign student - was arrested on suspicion of voyeurism but after 24 hours in custody was released on bail and allowed to return to to his native country.

She was later told the charges were dropped because there wasn't enough evidence.

Disappointed Sam told student newspaper The Tab: 'Unfortunately, as you can see, the pictures weren't the best quality but you can see how close the man was.

'The whole situation was hellish, and now this pervert's got off scot-free.

'If nothing else, I'm now much more conscious of my personal safety, even of just keeping my blinds drawn all the time.

'I'm also a lot more wary of people, even those who at first seem ok.’

The alleged pervert has since returned to the continent and did not respond to a request for comment.