A Detroit-area woman who pleaded guilty to having sex with the biological son she gave up for adoption and later tracked down on the Internet has been sentenced to up to nine years in prison.

Thirty-six-year-old Aimee L. Sword of Waterford Township apologized at her sentencing Monday in Oakland County Circuit Court. She had pleaded guilty to one count of first-degree criminal sexual conduct in a deal with prosecutors.

Police say Sword used Facebook in 2008 to find her son, who's now 16. She gave him up for adoption as an infant.

He testified they had sex in Waterford Township and Grand Rapids.

Waterford Township is 30 miles northwest of Detroit.