Preston Davey's birth mother sobbed in court as she told her son's adoptive killer fathers 'I will never forgive you' ahead of their sentencing today. Jamie Varley, 37, was found guilty this week of the murder of the 13-month-old baby boy in July 2023, who suffocated during sexual abuse. His partner John McGowan-Fazakerley, 32, a sales manager for a finance company, was also convicted of charges including causing or allowing Preston's death and jointly participating in a sickening sexual assault.Prosecutors said it was one of the 'most shocking and horrific' cases they have ever dealt with.Today, a statement from Preston's mother - convicted murderer Sarah Davey - was read out in court ahead of the pair's sentencing. She said her 'world had ended' when she found out that her son had died, adding that she now lives with the 'unimaginable pain of wondering what he went through'. Preston was born to Davey on June 16, 2022 after she was released from prison for callously ending the life of a pensioner at the age of just 14. She and 15-year-old Lisa Healey had tortured 71-year-old Lily Lilley by squirting shampoo in her eyes, cutting her with a knife and tying a gag around her mouth. Five days after giving birth to Preston, he was taken into the care of Oldham Council. He was then given to Varley and his partner for adoption.