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The mystery of the sexual assault and murder of an American teenager in Washington state has now been resolved 32 years after the crime thanks to a discarded napkin, DNA tests and genetic genealogy.In 2006 police scientists managed to reconstruct a DNA imprint from items collected at the crime scene, although no link was found to any known offender in the United States.Twelve years later progress came thanks to genetic genealogy, with its vast databases and archives, including from people researching their family history using DNA testing kits from companies like 23andMe and Ancestry.com.In April, genetic genealogy led to the arrest in California of a man suspected of being the "Golden State Killer" – blamed for 12 murders, some 50 rapes and scores of robberies in the 1970s and 1980s.
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