St. George's School, together with survivor group SGS for Healing, has hired a new investigator to handle the allegations of sexual abuse at the Middletown, Rhode Island school.

Just one week and two days after the school and group announced it retained former Massachusetts Attorney General Scott Harshbarger as lead investigator on the case of alleged sexual abuse, the school and alumni/victims' group have named Martin F. Murphy as its new independent investigator.

Murphy, a partner at the law firm of Foley Hoag in Boston, is a former First Assistant District Attorney in Middlesex County and former chief of the Major Crimes Division of the U.S. Attorney's Office for the District of Massachusetts.

The switch was made after the school and survivors group were "unable to reach agreement on legal terms of engagement" with Harshbarger and his Boston firm, Casner & Edwards, according to a release.

In a statement, the school and group said it has respect for Harshbarger and his work and is still committed to an independent and thorough investigation.