A mother was beaten to death in a planned attack by her teenage son who hated women and was obsessed with violence and serial killers. Tristan Roberts, from Prestatyn, Denbighshire, waited until he was 18 to buy the weapons he would use to murder his mother, including knives, hammers and axes. He announced his intention to kill 45-year-old Angela Shellis on social media platform Discord. Roberts, who pleaded guilty to murder at an earlier hearing was sentenced at Mold Crown Court to life with a minimum term of 22-and-a-half years. He recorded the prolonged attack on a Dictaphone and, after the murder, answered a message from his brother on his mother's mobile saying she was asleep in bed.…