(AP) — A 37-year-old southern Nebraska man has pleaded no contest to charges that he sexually assaulted a 13-year-old girl.

The Nebraska Attorney General Office says that Christopher Shoemaker, of Franklin County, pleaded no contest Wednesday to one count of first-degree sexual assault of a child and faces a mandatory minimum sentence of 15 years in prison.

Shoemaker is set to be sentenced on May 21 in Franklin County District Court.

Prosecutors say Shoemaker knew the girl and had sex with her last year.