 Corey loved his community, and most especially, Corey loved his family. Governors ordered flags lowered to half-staff in Pennsylvania. As for that 20-year-old suspect identified as Thomas Crooks, five of his former classmates described him to ABC News as a student who was quiet and did not have many friends. The parties continued to investigate, but have not yet determined a possible motive. The AR-15-style weapon was purchased legally by his father in 2013.