Robert Bayne, 21, denies murdering the Motherwell College student and setting fire to her body.

BBC: Murder trial hears of DNA match

At the High Court in Edinburgh, prosecutor Lesley Shand QC, said 21-year-old Robert Bayne went to "dreadful lengths" to conceal his crime.

BBC: Zoe murder accused Robert Bayne 'guilty of atrocity'

By this time, mouth swabs had been taken from Robert Bayne, who denies murdering the student and setting fire to her her body.

BBC: Murder trial hears of DNA match