A Bonny Doon man who was killed in a head on collision in Santa Cruz over the weekend has been identified. Officials say 44-year-old Thurston Erickson was travelling on Empire Grade Road Saturday afternoon when he collided with a 20-year-old woman. Erickson was pronounced dead at the scene. The woman was airlifted to a trauma center with severe leg injuries. Her condition is improving. The cause of the incident remains under investigation.