WATERLOO - A Waterloo woman was killed and two others were injured Sunday in a two-vehicle accident on Interstate 35 in northern Oklahoma.

Sheryl A. Dolan, 59, was pronounced dead at the scene after the Chevrolet Trailblazer she was driving was struck by a van at 2 p.m. Sunday just south of Tonkawa, Okla., according to the Oklahoma Highway Patrol.

Two Waterloo women in Dolan's vehicle were taken to Wesley Medical Center in Wichita, Kan. Kathyrn F. Grimm, 56, was admitted in critical condition with head injuries, while Marianna G. Gibbons, 61, was admitted in serious condition with an arm injury, the highway patrol reported.

Dolan was northbound in the left lane of the interstate when a van driven by Richard Benjes, 62, of Hutchinson, Kan., changed from the right lane to the left lane, forcing Dolan's vehicle off the road. After the collision, the Trailblazer left the roadway and rolled down an embankment.

Benjes was not injured in the accident.