A Swanzey teen was killed just after 2:30 am on Tuesday when his vehicle rolled over on Gilsum Mine Road in Alstead. Police say Jacob Nash 17, was deceased when they arrived at the scene, but passenger, Hayden Wilmott 18, of Alstead was treated on-scene for non-life threatening injuries. The preliminary investigation showed the 1995 Subaru Impreza was traveling southbound on the Gilsum Mine Road in Alstead at a high rate of speed and Nash failed to negotiate a right curve, making the car go off road and crashing into a rock. Neither of the teens were wearing seatbelts. The investigation is ongoing at this time.