A fan of Avril Lavigne has been convicted of first-degree murder for beating and stabbing his mother to death after she refused to arrange tickets for him to go to one of her gigs.
Robert Lyons, 39, faces 20 years to life in prison over the incident, which took place at the home they shared in Carol Stream in 2008.
The jury heard that Lyons twice hit his mother Linda Bolek across the head with a cognac bottle before stabbing her nine times in the back.
The knife attack was so brutal that one knife snapped off in Bolek's back, while another bent, reports My Fox Chicago.
Lyons, who has battled serious psychological and anger problems since he was a teen, was upset after his mum refused to allow him to call a friend to secure skybox tickets to Lavigne's gig.
“I think they reached the right verdict,” Bolek’s twin sister, Pat Lowry, said outside court.