Sister Helen Prejean at the 2014 Nobel Peace Prize Forum Sister Helen Prejean delivers a keynote address in Minneapolis at the Nobel Peace Prize Forum on March 1, 2014. The Catholic nun is best known for her activism on human rights and opposing the death penalty. She is the author of "Dead Man Walking" and "The Death of Innocence." Sister Helen Prejean says it is not enough to be charitable, we must be engaged in the work of justice. She calls capital punishment one of the greatest moral issues of our time.12:00 p.m.