SAR Staff, Hasty Team, RAVEN, SVU, and WCSAR responded on a mutual aid call to the Lahontan Reservoir area to assist Lyon County in searching for a horseback rider that did not come back from a ride.  He had taken two horses with him on Friday, but did not return on Sunday.  One of the horses arrived at the residence on Sunday evening.  A friend located the other horse and a saddle Monday morning.  Foot teams searched the immediate area around the location of the tethered horse, RAVEN searched the area from above, and ATV teams checked areas farther out from the location of the horse.  Late in the afternoon, RAVEN spotted the subject and guided foot and horse posse teams to the location.  The subject was deceased.