DNA testing led to the arrest in Gilgo Beach serial killer case

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The court documents outlined the evidence. A female hair was discovered on a belt used to tie Brainard-Barnes’ legs together.

There were two female hairs discovered on Waterman on the tape used to bind her body. And one hair was also found on a piece of tape used to bind Costello’s body.

Using mitochondrial DNA testing in 2023, all of the hairs were determined to be from the same woman. There is greater than a 99% match for Heuermann’s wife.

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Police don’t believe Ellerup was ever involved. They believe that when Heuermann committed the murders he had the hairs on his body.