"Holmes and his motives remained largely a mystery, with past associates saying he displayed no hints of a mental illness or violent tendencies. He was armed with a Smith & Wesson M&P .223 semi-automatic rifle, similar to an AR-15 assault rifle, a 12-gauge shotgun and a Glock .40-caliber handgun. Police found an additional Glock .40-caliber handgun in his car. All the weapons had been bought legally."