At approximately 1225 mountain time, a Cirrus SR20 struck terrain while maneuvering near Las Vegas, killing the pilot. Instrument conditions prevailed but the airplane was not on a flight plan. The pilot reportedly left Fargo, N.D., for Albuquerque and was reported overdue by a family member. An employee at the Las Vegas National Wildlife Refuge came upon the wreckage during a period of heavy fog and visibility of about 100 feet.