The New Hampshire State Police say a driver was injured and his passenger was killed in a one-car collision in Colebrook.
Local police responded to the crash just before 8 p.m. Friday on Piper Hill Road.
State police said in a news release Saturday that the preliminary investigation shows the car went off the road and struck some trees, landing on its side.
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They said 31-year-old Jonathan Flanders, of Stewartstown, was pronounced dead at the scene.
The driver, identified as 26-year-old Nathan Mills, of Stewartstown, was injured and taken to a hospital.
State Police say speed was considered a factor in the crash.