PLYMOUTH, Mass. (AP) — A Randolph man has pleaded not guilty to upgraded charges brought in connection with a dirt bike crash he was involved in in December that took the life of a 14-year-old boy.

Christopher Kelly on Monday pleaded not guilty to a charge of negligent operation of a recreational vehicle resulting in the death. The charge was brought Friday.

The 40-year-old Kelly had previously only been charged with misdemeanor leaving the scene of an accident.

Police say James Ward Jr., a freshman at Plymouth North High School, was killed on Dec. 9 when he and Kelly had an off-road collision.

Authorities say Kelly, who was hurt, left the scene to get help but never returned.

Kelly, an accomplished motocross racer, has expressed remorse, telling The Enterprise (http://bit.ly/14HdlQR ) that he was suicidal.

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Information from: The (Brockton, Mass.) Enterprise, http://www.enterprisenews.com