PEORIA, Ariz. -- A 19-year-old motorcyclist was found dead Monday in the desert near Lake Pleasant. Daniel Lindsey apparently became a victim of sun and heat on Sunday, when the high temperature reached 110 degrees, said officials from the Maricopa County Sheriff's Office. Lindsey, of Farmington, Mo., and a companion had gone motorcycle riding in the desert on Sunday morning. He told the friend he was dehydrated and was going to return to his pickup truck but never made it. Searchers found his motorcycle, helmet and jump suit on Sunday. Sheriff's spokesman Lt. J.J. Tuttle said tracks in the area indicate that Lindsey was disoriented. He appeared to have been walking in circles. Lindsey was living in Phoenix while attending a motorcycle mechanics school.