A motorcyclist discovered dead Thursday evening along a Gwinnett County roadway was apparently killed  in a crash that occurred days earlier, police said.

Gwinnett police Cpl. Edwin Ritter said James Etheridge was riding a motorcycle east on Mount Moriah Road near Auburn when he "was unable to negotiate a left curve in the road and struck a guardrail."

Ritter said Etheridge, 39, of Duluth, then continued down an embankment and struck several small trees. Etheridge died at the scene.

"It is believed that the driver had been deceased for at least a couple of days before being discovered," Ritter said, adding that neither Etheridge nor the motorcycle were visible from the roadway.

Staff writer Alexis Stevens contributed to this article.