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EVERETT, Wash. — Laura Baanstra still remembers waving to her brother Jay Cook as he drove away from their Victoria home on Nov. 18, 1987 to pick up his girlfriend and head to Seattle for an overnight trip.

She never imagined it would be the last time she would see her 20-year-old sibling.

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Jay’s body was found days later dumped on the side of the road in Snohomish County, covered with a blue blanket. He had been strangled.

His 18-year-old sweetheart, Tanya Van Cuylenborg, was also found slain in a ditch in neighbouring Skagit country. She had been sexually assaulted and shot in the back of the head.

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For more than 30 years, detectives in both counties have worked tirelessly to find the young couple’s killer without success, despite having collected his DNA.

But they hope new DNA technology that helped create composite drawings of a person of interest in the case might lead to a breakthrough.

Baanstra, her husband Gary and sister Kelly Cook were on hand at a news conference in Everett on Wednesday where images were released of what the man may have looked like at ages 25, 45 and 65.