A 20-year-old nursing home aide, Thomas Matthew Crooks, was shot dead by law enforcement after allegedly attempting to assassinate former President Donald Trump at a rally in Pennsylvania. Crooks, who was described as a quiet and bright student, fired an AR-15-style rifle at Trump from a rooftop location. The attack, which resulted in the death of a 50-year-old man and injuries to two other spectators, has left authorities and residents bewildered, seeking answers to what motivated such a violent act.