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But following an appeal, it is now being re-examined.

Forensic scientists re-examined evidence from the time of her disappearance and found DNA from Tobin's son on Vicky's purse, which had been left near Edinburgh bus station.

Det Con Kevin Newton from the Metropolitan Police told the court he had spent more than 100 hours examining and re-examining video footage of the attack.

A Home Office report in 2015 looked at 32 unexpected deaths that police had concluded were not suspicious but were then re-examined by forensic pathologists.

DNA matching Newton was found on nail clippings taken from Mrs Crown's unburnt right hand in 2013, and they were re-examined using modern techniques 10 years later.