St. Joseph's Academy alumna Sister Helen Prejean addressed students and faculty there Tuesday, Sept. 11, 2018, as part of the school's 150th anniversary speaker series. The 1957 graduate became a nun and later an outspoken opponent of the death penalty, and is well known for the 1995 movie 'Dead Men Walking,' based on her book about mentoring two men on death row at Louisiana State Penitentiary at Angola.