The mystery of the sexual assault and murder of a US teenager in Washington state has been resolved 32 years after the crime thanks to a discarded napkin, DNA tests and genetic genealogy. Gary Hartman, 66, has been arrested and is scheduled to appear in court Monday on rape and murder charges in the case, which has long shocked the city of Tacoma, in the northwestern US state. It began on March 26, 1986, when 12-year-old Michella Welch disappeared while playing with her two young sisters at a park.
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