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Today in True Crime History: March 18
1977— Mary Boyle disappears at the border of County Donegal and County Fermanagh in Ireland. Today, her disappearance is the longest missing child case in the Republic of Ireland.
1989 — Dennis Dechaine is convicted in the murder of Sarah Cherry one year earlier. He is sentenced to life in prison.
1990 — Two thieves break into the Isabella Gardner Museum in Boston and steal 12 pieces, including those by Vermeer and Rembrandt. They have not been found.
2016 — The body of Jessica Cain is found in a field near East Orem Road in Texas. She was last seen at a Bennigan’s restaurant with friends at 1:30 a.m. on August 17, 1997.