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

She recalled that Ms Nelson had bruises on her face and body, saying she told her friends she had "been fighting with Robert Bayne the night before".

BBC: Murder trial told Robert Bayne 'fought with' Zoe Nelson

The prosecutor also told the jury that although she was inarticulate and an undeniably reluctant witness, Zoe's younger sister, Laura Anne, had been truthful in her account of how she was allegedly shown the badly burned body by Robert Bayne.

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