William Laws Calley Jr. (born June 8, 1943) is a former American army officer and war criminal convicted by court-martial for the premeditated killings of 200 to 400 unarmed South Vietnamese civilians in the Mỹ Lai massacre on March 16, 1968, during the Vietnam War. Calley was released to house arrest under orders by President Richard Nixon three days after his conviction. A new trial was ordered by the United States Court of Appeals for the Fifth Circuit but that ruling was overturned by the Supreme Court. Calley served three years of house arrest for the murders. Public opinion about Calley was divided.