It was a case that gripped the nation and sparked legal debate: Can someone cause another person to take their own life using only words? Michelle Carter was 17 when she encouraged her boyfriend, Conrad Roy Jr., to kill himself in text messages and phone calls. Roy took his own life in July 2014 in his truck, succumbing to carbon monoxide poisoning. Carter was found guilty of involuntary manslaughter in 2017. A new HBO documentary explores the case.