The BAU has encountered numerous unsubs with heart-wrenching pasts, and some stories stand out more than others due to the unimaginable trauma these characters experienced. One of the most tragic stories involves William Taylor, a father who, after losing his daughter in a sleep-deprived state, spirals into a killing spree, believing his victims were involved in her abduction. Let’s delve into the tragic pasts of these unsubs, starting with the heartbreaking events that shaped them.