Wilseyville is an unincorporated community in Calaveras County, California. It lies at an elevation of 2769 feet. Wilseyville's post office was established in 1947; it has the zip code 95257. Wilseyville was named after Lawrence A. Wilsey, an executive at the American Forest Products Company.Wilseyville is notorious for being the location of the ranch where serial killers Leonard Lake and Charles Ng killed and disposed of some of their victims. Their spree ended in June 1985, when Ng was spotted loading stolen merchandise into a car driven by Lake in South San Francisco. Ng fled, but Lake was arrested at the scene for illegally outfitting a .22 caliber pistol with a silencer. He swallowed a cyanide pill while in police custody and died four days later. Police found human remains and other evidence at the Wilseyville ranch and began a manhunt for Ng. He was arrested in Canada while shoplifting and was extradited to the United States after serving a sentence in Canada.