Three more murder charges have been filed in Calaveras County against Charles C. Ng, 25, who previously was accused of killing eight people at a remote mountain cabin where 11 bodies and about 40 pounds of splintered human bones were recovered last summer. Dist. Atty. John Martin said his office now has sufficient evidence to charge Ng in the deaths of Harvey and Deborah Dubs and their 16-month-old son, Sean. Ng and Leonard Lake, 39, are accused of committing the murders as part of their sexual enslavement fantasy. Lake committed suicide shortly after his arrest a year ago. Authorities are attempting to extradite Ng from Canada, where is serving a sentence for theft and an attempted murder that led to his capture.