The skeleton of a wealthy service station owner has been found in a cave, 17 years after his disappearance. Police have ruled his death a homicide. An amateur cave explorer found the skeleton of Gary R. Simmons on Wednesday. The remains were clad in cowboy boots and decaying clothing. Simmons' driver's license was in the pants pocket. Gary Compton, a private investigator hired by the family, said he believed Simmons was killed because he planned to testify in a federal investigation of black market gasoline. Simmons was last seen alive in 1974. He was declared dead in 1981.