In October of 2014, Steven Pratt was supposed to begin his life anew. He had served out a 30-year prison sentence and gone home to Atlantic City, N.J., where his family held a party to welcome him. But a violent history would repeat itself all too soon. Pratt was 15 when he got into an argument with his next-door neighbour, Michael Anderson. Court records show that Anderson was a father figure of sorts to Pratt. On Oct. 11, 1984, he asked Pratt and his friends to vacate a hallway in their apartment building where they were noisily hanging out and...