On the first day of his trial, Daniel Weisberger arrived at the Key West courthouse dressed in a blue blazer, chinos and black-framed glasses. His short dreads had been cropped. At 21, he no longer looked like the 17-year-old teenager who murdered his little brother in the room they shared. Over the course of a two-week trial, investigators, witnesses, family and mental health experts retrace Daniel’s path to that bloody day.