Sister Helen Prejean, author of the acclaimed book "Dead Man Walking: An Eyewitness Account of the Death Penalty in the United States" (Random House, 1993), will discuss "Dead Man Walking: The Journey" as the annual Bertha May Bell Andrews Memorial Lecture in Ethics and Education at 7 p.m. Wednesday, March 24, in the Bates College Chapel. The public is invited to attend free of charge.