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A former Southern California bicycle motocross coach was convicted Monday of sexually assaulting three boys, some of them under the age of 10.

Mandak Kohn Griffin of Cypress was convicted by an Orange County judge of 13 felony charges, including possession of child pornography and committing lewd acts on a child, the Orange County Register reported.

He could face up to 85 years to life in prison when he is sentenced in April.

Prosecutors said Griffin, 40, befriended neighborhood boys, inviting them to hang out at his home and look at pornographic movies and magazines.

Griffin’s attorney, Cameron Talley, didn’t deny that his client had child pornography or had taken explicit photographs of at least one boy but Talley argued there wasn’t any evidence that Griffin had sex with the victims, the Register reported.