A man who died in 1999 has been identified as a suspect in the 1980 killing of an Irvine mother in Newport Beach, thanks to advances in DNA technology and investigative genetic genealogy, police announced Monday. Kenneth Elwin Marks is believed to be the person responsible for killing 42-year-old Judith “Judy” Nesbitt on Nov. 26, 1980, while she was showing her family’s boat to a man she thought was a potential buyer, Newport Beach Police Department officials said in a news release. That afternoon, Marks followed Nesbitt into the boat’s sleeping quarters and, after a violent struggle, shot the mother...