Moira Orr, who leads on homicide and major crime for the Crown Office and Procurator Fiscal Service (COPFS), said after the killers were sentenced: "The depraved and predatory actions of Dylan Brister and Cameron Allan have robbed a family of their loving son, father, partner, nephew and grandson.
'I was left sickened after my partner was drugged, raped and murdered during night out' A woman whose partner was drugged, raped and murdered during a night out said she felt "sickened" when police knocked on her door to inform her of the tragic news.
Talking about the last time she saw Calum alive, Bobbie said: "The night Calum went out, we'd had a few words and he left on a bad note.
The investigation found that Dylan Brister, 27, and Cameron Allan, 21, spiked Calum's drink, leaving him unconscious, before subjecting him to a serious sexual assault which they recorded on a mobile telephone.
The mum-of-four, from Fife, Scotland, is now raising their children - Calum, Mirren, Romi, who has a different dad but was loved by Calum as if she was his daughter, and Lyla - alone.