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Dennis Palmer (33 years old) lived with his girlfriend at his home on Middle Bar Road in ​Jackson at the time of his death in 1987. On August 3, 1987, Palmer's girlfriend left for ​work from the residence at approximately 6:30am. Palmer was still in bed at the time, ​but mentioned that he was thinking about visiting his parents in Alpine County later in ​the day. When she returned home from work, Palmer was gone as was his pickup ​truck. After Palmer failed to return, Palmer's girlfriend contacted his parents, who ​advised that he never arrived at their residence. 

​Friends of Palmer's were notified of his disappearance and began conducting a search of ​the area during the week, but were unable to locate him. 

​On August 10, 1987 the Amador County Sheriff's Office continued their search for ​Palmer. On August 20, 1987, the body of Dennis Palmer was discovered in a mine shaft ​on his property.