Sister Helen Prejean, the author of "Dead Man Walking: An Eyewitness Account of the Death Penalty in the United States," delivers the convocation address to the incoming students at Salve Regina University on Tuesday, shortly after she was awarded an honorary Doctor of Humane Letters by the university. Sister Helen tells how she woke up to her calling, after she became a nun, when she reluctantly attended a conference. "We were going to be captive for three days with this social justice nun," she said, praying, "help me get through this." That was a dangerous prayer, she told the Class of 2022.