Deryck Whibley claims the abuse began when he was a teenager and his alleged abuser, Greig Nori, was in his 30s.

Whibley claims the abuse from his manager intensified after he began a relationship with Avril Lavigne, to whom he was married from 2006 to 2009.

Sum 41 is a multi-award winning punk band formed in 1996 that has sold more than 15 million albums worldwide. Whibley's memo

The musician opens up for the first time about the alleged abuse and grooming in his new memoir, "Walking Disaster: My Life Through Heaven and Hell."

In his new memoir, Deryck Whibley of Sum 41 accuses his band's former manager Greig Nori of sexual abuse and grooming. As revealed Tuesday (Oct. 8) in the newly published pages of Walking Disaster: My Life Through Heaven and Hell,

In a new memoir and newspaper interview, Deryck Whibley alleges that Avril Lavigne told him he was being sexually abused by his manager.

Deryck Whibley is ready to tell you everything. When the Sum 41 frontman first sat down to write what would become his unflinching memoir, “Walking Disaster: My Life Through Heaven and Hell,” he genuinely didn’t think his life merited an autobiography.

In a new memoir, Sum 41 frontman Deryck Whibley alleges that the band's former manager and Treble Charger singer, Greig Nori, sexually coerced and groomed him when he was a teenager.