Experts say Johnson's medical path is the determining factor in comprehending his mindset on the fateful night of July 7, when he opened fire at a peaceful anti-police brutality rally.

The conspiracy theories have already started to fly on social media as racial tensions rise over the deaths of two unarmed Black men, Philando Castile and Alton Sterling, followed by the deadly ambush of five Dallas, Texas police officers, who were allegedly shot by a lone Black man. The loss of life on both sides […]

According to the FBI, Johnson was armed with an SKS semiautomatic rifle and wore ballistic body armor with plates. The SKS is a Soviet-designed military rifle first introduced in 1945.