Authorities in Texas say the shooter who opened fire at a megachurch in Houston on Sunday had legally bought an AR-15-style rifle in December despite having a criminal record and a history of mental illness. Police identified the shooter as Genesse Ivonne Moreno, who was shot dead by off-duty police officers working inside Christian pastor Joel Osteen’s church. Two other people were injured, including the shooter’s 7-year-old son, who was shot in the head by guards. He remains in critical condition.