A Lake Charles man is dead following a one-vehicle accident on Highway 90 in Sulphur. State Police say 28-year-old Edward Rigmaiden was traveling eastbound near milepost 24, when for some unknown reason he traveled off the roadway and struck a tree. Rigmaiden was pronounced dead at the scene. A passenger in the vehicle was transported to West Cal-Cam Hospital with moderate injuries. Standard toxicology tests are pending.