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.

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,

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.

Sum 41 frontman and guitarist Deryck Whibley writes in his new memoir, Walking Disaster, that the band’s former manager, Greig Nori, sexually abused him as a teenager, per The L.A. Times. Whibley also states that Nori verbally abused him and accused him of grooming.