OMAHA, Neb. (AP) — Prosecutors say a 45-year-old suburban Omaha assistant high school principal had sex with a 15-year-old student on school grounds.

The details were made public Tuesday when a judge upheld Matthew Fedde’s $500,000 bail. Fedde remained jailed Wednesday.

Investigators say Fedde had multiple sexual encounters with the student on school grounds starting in September. Fedde was arrested last week after the girl’s parents found references to a sexual relationship with Fedde in her diary. An arrest affidavit says investigators also found text messages between the girl and Fedde.

Fedde’s lawyer, Matthew Bond, says Fedde is innocent and will fight the two felony counts of sexual assault of a child.

Fedde is on administrative leave from the Millard School District.