PORTLAND — A 41-year-old Biddeford man pleaded not guilty today to federal charges of cyberstalking and identity theft.

Shawn Sayer entered the plea at U.S. District Court.

He is accused of stalking his ex-girlfriend for four years after they broke up in 2006, even after she changed her name and moved from Maine to Louisiana.

Sayer was convicted of stalking in a state court in 2006 and last year pleaded guilty to separate state charges in a plea agreement that sent him to jail for 22 months. In that case, he was sentenced for violating bail conditions and violating a protection order.

If convicted of the federal charges, he would face up to 10 years in prison on the cyberstalking charge, five years on the identity theft charge and a $250,000 fine on each charge.

The investigation leading to the federal charges was conducted by the computer crimes unit of the Maine State Police with assistance from the Secret Service.

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