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VIRGINIA BEACH, Va. (AP) — Authorities in Virginia Beach hope new technology can help them finally close a decades-old cold case homicide.

The Virginian-Pilot says investigators believe a type of DNA testing called phenotyping could feasibly help them catch the killer of Roberta Walls. She was 22 in 1986 when her battered body was found behind a school.

The newspaper says a Reston lab has recently created two composite sketches of a “person of interest” using DNA phenotyping. The technology uses genetic material to predict the physical appearance and ancestry of an unknown individual.

Police have released composite sketches showing a man with brownish hair, either blue or green eyes, and freckling.