Marie Roberts, the widow of the killer of five Amish girls in a schoolroom massacre in rural Pennsylvania, has written to the families of his victims thanking them for their forgiveness.The hamlets of Nickel Mines, where the children lived, and Georgetown, the home of Charles Roberts, a milkman who killed himself after shooting dead the girls and injuring a further five, are slowly recovering. At the weekend, Mrs Roberts remained too distressed to give an interview but she issued a letter to her neighbours. Mrs Roberts, now a lone parent to three children, said her family was overwhelmed by the...