A student at Endicott College was killed late last night when he was struck by an SUV on Route 128 north in Beverly, state police said.Investigators found a skateboard at the scene, but department spokesman David Procopio said it was not immediately clear whether the victim was carrying or riding it when he was struck in the left travel lane at midnight.The identity of the 20-year-old Boxford resident was not immediately released.He was pronounced dead at the scene.