HAVERHILL, Mass. — State police have identified a person involved in a deadly highway crash.Officials say Methuen teen Alexis Spartz was killed in a single-car crash on Interstate 495 Saturday evening in Haverhill.Eighteen-year-old Spartz was driving a 2004 Lincoln LS when she crashed, rolling over the car.Local firefighters freed Spartz and her passenger from the car shortly after 6 p.m.