A West Lothian woman found footage of a man raping her while trying to uncover his alleged affair.
The victim was sickened to discover Martin Gavin had taken advantage of her while she was asleep.
A judge heard how the supermarket worker had also taken “several hundred” intimate photos of the woman.
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The 59 year-old first offender has now been jailed for five years and seven months at the High Court in Glasgow on Monday.
He earlier pled guilty to rape, sexual assault and recording the victim without her knowledge.
The crimes spanned between 2012 and 2016.
Prosecutor Alan Parfery told how the victim “became suspicious’ in September 2020 that Gavin was having an affair.
Mr Parfery: “She looked at his iPad and saw a picture of a naked woman.
“This gave her further cause to suspect that he was being unfaithful.”
The woman was later back at his home in Whitburn, West Lothian while Gavin was not in.
She clocked his iPad was no longer in its usual place, but two USB sticks were there instead.
The woman took the storage devices away with her Rather than finding evidence of any adultery, she found how predator Gavin had preyed on.
Mr Parfery: “She saw numerous images of the her.
“She expressed shock and was unaware they had been taken by Gavin.
“There was also a recording of Gavin setting up a camera before she came into the room.”
A friend of the woman reported the find to police on her behalf.
Officers went on to recovered a number of electronic devices belonging to Gavin.
They contained videos which included Gavin having sex with the woman while she was asleep.
There were a further three clips of him molesting her while she was unaware.
Mr Parfery further told the court of “several hundred” intimate images of the victim.
Frances Connor, defending, said: “When I first consulted with him, he Indicated immediately his intention to accept responsibility for his wrong doing.
“He could not tell me in great detail the content of these devices.”
The court on Monday heard how social workers compiling a pre-sentencing report "took a particularly dim view" to Gavin apparently trying to lessen the seriousness of the crimes.
But, judge Lady Stacey told Gavin: "This is a horrific breach of trust. What you did without her knowledge is extremely serious."
Gavin was also put on the sex offenders list.
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