A 15-year-old Colorado City bicyclist died after colliding with a tractor-trailer near the Utah-Arizona border, The Arizona Highway Patrol said.

Louis John Stewart died of massive head and internal injuries following the noon Wednesday accident.An AHP dispatcher in Flagstaff, Ariz. said the accident occurred when Stewart, crossed the road and was struck by a semitrailer truck driven by John Wheeler, 31, of Roy, Utah.

Wheeler was not injured.