LESTER HOLT: Good evening, everyone. It has one of the largest congregations in the country. And tonight after the terrifying shooting inside Joel Osteen's Lakewood church in Houston, disturbing clues are emerging about the woman who carried it out. Police say she brought her 7-year-old son inside the church on Sunday between services, and opened fire in the hallway with an AR-15 rifle. Two off-duty officers engaged her in a shootout, ultimately killing her. Her son critically wounded in the head. And police today revealing a sticker on her gun had the word "Palestine" on it and that she left behind antisemitic writings along with suspicious chemicals found in her home. None of which law enforcement officials say adds up to a conclusive motive.