A 25-year-old man from Des Moines was killed in a single-vehicle accident Saturday near Ames. The Iowa State Patrol reports that Richard Lee Boner was a passenger in a 2004 Chrysler Sebring, driven by 24-year-old Katy Sueann Markham, also of Des Moines. Markham was driving southbound on Interstate 35 about three miles south of Ames when for unknown reasons, she lost control of the vehicle, entered the median and rolled. Boner was not wearing a seatbelt and was ejected from the vehicle. He was pronounced dead at the scene. Markham was airlifted to Methodist Hospital in Des Moines. The accident remains under investigation.