During Northern Ireland's "Troubles," a gang of masked people dragged Gene McConville away from her 10 kids.

"Watch the children until I come back," she yelled to her oldest son.

But they never saw her again, and were abandoned after her assumed death. Years later, McConville's body was found with a single gunshot wound to the head.

While the murder remains unsolved, an author says he used a secret archive to finally identify her killer.

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