“20/20” looks at the case of Mary Winkler and the trial that shocked a nation. ByCalvin Milliner, Henry Lievsay, Jonathan Leach, and Keren Schiffman On March 22, 2006, minister Matthew Winkler was found dead, shot in the back in his Selmer, Tennessee, home. Winkler’s wife, Mary, and the couple’s three children were missing in the aftermath of the grisly discovery, and there was growing concern that the family had been kidnapped.