GRAND RAPIDS, Mich. (AP) — A former host at a popular Christian radio station in western Michigan is expected to plead guilty in a child pornography investigation.

Prosecutors say John Balyo is due in Grand Rapids federal court Tuesday, just weeks after his arrest on state charges at a Christian music festival in Gaylord.

The 35-year-old Balyo is charged with sexual exploitation and possessing child pornography. His signed plea deal was filed in court Thursday.

Balyo faces a mandatory minimum of 15 years in prison but his sentence could be longer. He was a host at Christian radio station WCSG in Grand Rapids before his arrest in June. He's being held in the Calhoun County jail on state charges of criminal sexual conduct.