In the town where I go to uni, a gang of four people have just been given life sentences for one of the most chilling murders I've ever heard. (The following is pretty grim)
They befriended a guy with learning difficulties and manipulated him to get money out of him, which they spent on drugs. Eventually when they ran out of drug money, they kidnapped him and held him hostage, beating him with a baseball bat and threatening to kill him. He didn't have any more money to give them so there was nothing he could do. After about 5 days of constant beatings and taking photos of him cleaning his own blood up off the floor, this gang realised that if they let him go, he'd go to the police. So they decided to kill him by repeatedly stabbing him in the neck, then putting his body in a bin and setting fire to it. Immediately afterward doing so, they went to a rave in a neighbouring city.
They all plead not guilty in their trial, too. Ugh.