The FBI is offering a $5,000 reward for information leading to an arrest in a 2013 unsolved homicide.

The body of Caldwell Dewyne Smith was found Sept. 15, 2013, in Shonto, Arizona, on the Navajo Reservation, authorities say.

The cause of death was a "penetrating wound" from a weapon, said FBI spokesperson Jill McCabe.

The FBI is not releasing many details to protect the integrity of the investigation, McCabe said.

Anyone with information about this homicide can call the FBI at 623-466-1999 or they can report any tips to tips.fbi.gov.

Reach the reporter Christopher Roth at Christopher.Roth@gannett.com or on Twitter @cprothnews.