A new lead investigator has been chosen to look into allegations of sexual abuse at a prestigious Rhode Island boarding school.

The announcement on Wednesday that Boston attorney Martin Murphy will lead the investigation into St. George's School comes a week after former Massachusetts Attorney General Scott Harshbarger was chosen to lead.

An attorney for the accusers won't say why Harshbarger is no longer investigating. Harshbarger hasn't returned a call seeking comment.

Murphy represented Dr. Dirk Greineder, who was convicted in 2001 of killing his wife. They had argued at trial a stranger did it.

In 2014, Murphy was named a special prosecutor in the 2009 death of a hospital patient. Three former hospital guards have been indicted on manslaughter charges in the case.

Murphy will be assisted by former Massachusetts Attorney General Martha Coakley.