Who Killed Jean McConville? In 1972, the I.R.A. abducted and “disappeared” Jean McConville, the mother of ten children, most of whom were teen-age or younger. Her case became one of the most notorious unsolved murders of the long period of unrest in Northern Ireland known as the Troubles. While researching for his new book “Say Nothing,” Patrick Radden Keefe stumbled across an overlooked clue. He’s pretty sure now he knows who murdered McConville.