Authorities are investigating a deadly accident that happened this morning in Topsfield. The Washington county sheriff's department says two vehicles collided on route one near Malcolm hill just after seven o'clock. They quickly discovered that 18 year old Dylan Porter of Brookton was killed in the crash. 39 year old Kevin Lagase of New Brunswick was the other driver. He wasn't injured. Deputies closed off the roadway for several hours as investigators documented the scene. At this point they don't know what caused the crash, but say alcohol, speed and the road conditions do not appear to be factors.