I never imagined that someone I knew personally would become the victim of a horrible rage murder, but while I was writing my book, Why We Snap, the unthinkable happened. I tell the tragic story of the savage killing of Geoff Farrar by David DiPaolo at Carderock, a popular rock climbing area near my home, as a vivid example of the type of perplexing rage killing involving two very close friends that fill the daily news. Knowing the two men personally enabled me to provide their backstories for a perspective that is almost always missing from such shocking news accounts. But I had to tell the story as a “who done it,” because I did not want to undermine the trial in any way. I knew exactly what had happened from my interviews with the people involved, but until the frustratingly slow wheels of justice could reach their conclusion, I had to maintain the presumption of innocence and preserve testimony for court.