Sister Helen Prejean is a Roman Catholic nun and anti-death penalty activist from the United States. She gained national attention for her book, *Dead Man Walking*, which recounts her experiences as a spiritual advisor to death row inmates. Her work emphasizes the moral implications of capital punishment and advocates for the sanctity of life. In addition to her writing, Sister Prejean has been involved in various organizations that promote social justice and human rights. She has spoken out against the death penalty in numerous forums, including legislative hearings and public events, and has worked closely with groups like the Catholic Church and Amnesty International.