Illegal a Suspect in Four Nevada Murders:  Wilbur Ernesti Martinez-Guzman, 19, was arrested Saturday for the murders of four people in northern Nevada.  Samuel Chamberlain of Fox News reports that the killing began on June 10 when the body of Connie Koontz, 59, was found in the small town of Gardnerville.  Three days later the body of 74-year-old Sophia Renken was found in her home about a mile away.  On January 16, the bodies of an elderly couple, Gerald and Sharon David, were found in their home in south Reno.  All four victims were shot and their homes had been burglarized.  A tip led police to Guzman, an illegal alien living in Carson City.  The Washoe County  Sheriff told reporters that "we feel confident we have the evidence to link him to all four homicides."