Sister Helen Prejean, author of “Dead Man Walking,” made a visit last month to the Medill School of Journalism to share her thoughts on the death penalty. “The main question that we have to ask ourselves,” she said, “is what kind of society do we want to be and what does it say about us when we imitate the killers as a means of revenge?” While writing letters to death row inmates in the 1980s, Prejean met Patrick Sonnier, who was convicted and sentenced to die in the electric chair. She served as witness to Sonnier’s execution and was so moved by the experience that she decided to share her story. Prejean spoke to a capacity crowd at the McCormick Tribune Forum as part of the ongoing Crain Lecture series.