Just two weeks after child-welfare officials removed four children from a vermin-infested house in Blackstone, Massachusetts, investigators have found the remains of three infants. A woman, Erika Murray, 31, was arrested Thursday and will be charged with witness intimidation in addition to other unspecified charges connected to the living conditions. It is unknown whether she was related to any of the children. So far there are no homicide charges, and the genders, ages, and causes of death have not been determined. “What we know is that we have three infants that have been found deceased at this residence,” District Attorney Joseph D. Early Jr. said. “The house is filled with vermin. We have flies, we have bugs. We have used diapers, in some areas as much as a foot-and-a-half to two-feet high.