JACKSON, Wyo. (AP) — A northwest Wyoming school district is being sued for negligence after a school bus ran into a man in the fall of 2017.

The lawsuit filed in Teton County District Court says 57-year-old Rick Walsh, a resident of Natrona County, was riding his motorized bicycle on Oct. 4, 2017, in Casper when he was hit by a Teton County District No. 1 bus that was on an activity trip.

Lawyers for the school district have denied any negligence.

According to the complaint, Walsh suffered traumatic brain injuries and now lives in a group home.

His mother, Jacqueline Willis, has been legally appointed conservator and guardian of her son and filed the lawsuit, which seeks at least $1 million in damages.