A girl who went undercover with detectives after her fiancé confessed to killing a bike owner has advised Sky News she fears he'll hunt her down in the future. 

Caroline Muirhead single-handedly helped solve the mystery surrounding Tony Parsons who vanished close to Bridge of Orchy in Argyll and Bute throughout a 103-mile solo trek by the Scottish Highlands in September 2017.

After three years of frantic police searches, involving mountain rescue groups, the investigation got here to nothing.

In an unique broadcast interview, the 32-year-old physician advised Sky News she went to police in November 2020 after her then accomplice Alexander McKellar drunkenly confessed to mowing down and killing the most cancers survivor.

Caroline has shared a video with Sky News of the pair collectively in a automotive moments earlier than the reality got here out.

She describes seeing a police automotive passing and Alexander flinching with nerves.

She stated: "The whole dynamic in the car felt awkward. I pulled over… and asked what was wrong. He told me to give him my phone and keys."

Caroline recalled that she thought to herself: "You're in the middle of nowhere. You're in danger here."

She stated he then blurted out: "It was an accident. We killed a man a few years ago. This guy's on the estate. You jog past him most days."

Alexander (also called Sandy) and his twin brother Robert McKellar, who was a passenger within the automotive, did not name 999 earlier than concealing Tony's stays in close by farmland used for disposing of lifeless animals.

In the aftermath of the confession, Alexander led Caroline to the burial website the place she dropped a Red Bull can as a marker.

"He literally just lights a cigarette and taps around and goes 'here'. I just threw this Red Bull can over my right shoulder. I went back to pick it up after Sandy accused me of littering.

"It was frosty. I crunched the can into the bottom as a result of…there is not any different manner you'd ever know the place that man was."

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Caroline, who is a pathologist, became the prosecution's key witness but now alleges detectives forced her to continue spying on the twins for nine months to help build as strong a case as possible.

Scotland's police watchdog is now investigating potential criminality involving officers.

The 32-year-old alleges officers within the Bridge of Orchy space leaked key proof revealing the very important half she was secretly enjoying within the legal inquiry.

She claims there was a second within the native pub the place her cowl was blown: "And the guy behind the bar goes….'do you want a Red Bull sugar free like the gravesite'.

"Then folks began spitting at me. I walked into the pub and everybody went silent. The girl advised me I used to be not welcome."

Criticising Police Scotland's handling of her evidence, Caroline said: "I've not simply been manipulated by being lied to. I've been violated. I've been abused and brought benefit of.

"I literally gave them as much as I could above and beyond. They never saw me as a human. They terrorised me. They intimidated me. They took me out of my job. Here I am, I've lost my job. I've lost my possessions. My family are terrified."

A Police Scotland spokesperson stated: "It would not be appropriate to comment on these assertions as criminal proceedings have not concluded.

"There are a variety of excellent complaints which shall be progressed on the conclusion of all legal proceedings."

Caroline told Sky News she has been offered 24-hour security cameras at the Glasgow home she shares with her parents amid concerns for her welfare.

She agrees "100%" that one day Sandy could harm her upon his release from prison.

"You're telling me that man is not going to come knock on my door when he gets out."

Caroline is now demanding better help and safety for witnesses in High Court trials.

Sky News understands she has met legal professionals and is exploring the choice of taking authorized motion in opposition to legal justice authorities in Scotland.

Alexander and Robert McKellar are attributable to be sentenced in Glasgow on Friday.

Tony Parsons' household described him as "a much-loved husband, dad and grandad".

In a earlier assertion, they stated: "When he said goodbye and set off on his charity cycle from Fort William that Friday, none of us expected it to be the last time we would be able to see or speak to him.

"As you'll be able to think about, not realizing what has occurred to somebody after which the devastating news that we had been supplied has taken its toll on all of us as a household."