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WARREN, Maine (AP) — A former Seattle transient who was linked to a 1976 killing thanks to a DNA sample from chewing gum has died while serving a 20-year sentence in Maine.

Gary Raub, who was 67, pleaded guilty and was sentenced in 2014 for the fatal stabbing of a 70-year-old woman who took him in as a boarder in Augusta, Maine.

The Maine Department of Corrections said Raub died Wednesday night at PenBay Medical Center.

The attorney general, state police and state medical examiners were all notified in accordance with Maine State Prison policy. No further details were released.

Raub was charged after Seattle police collected a DNA sample through a ruse that involved paying him $5 to participate in what they told him was a chewing gum survey.