My Son’s Classmate Grew Up to Be a Killer

From the moment Darren was born, I tried to keep him safe and teach him right from wrong. Then his classmate pulled out a crossbow. Darren was only two when his father and I divorced. My ex and I shared custody but we didn’t like each other much. We married young and soon grew apart as we discovered how different we were.

Bob liked cars and scuba diving, interests I did not share. I liked books and outings with friends, while he preferred his record collection. Somewhere in those years, love...