Now that Micah Xavier Johnson has been identified as the Dallas shooter who killed five officers during a peaceful protest, more details are coming out about Johnson and his past.

Recently, outlets revealed that Johnson was discharged from the US Army when he was caught stealing the underwear of a female corporal, who then filed a sexual harassment complaint. It appeared that the corporal worried for her safety and requested that Johnson be ordered to stay away from her and be given mental health treatment.

After being sent home from Afghanistan, Johnson sought an outlet in the Black Lives Matter movement. When he attempted to join one Black activist group, someone tipped off Ken Moore of the Collective Black People’s Movement to look into the past of Johnson.

Upon running a background check on Johnson, Moore discovered that he had been discharged from the army for sexual assault; thus, Moore labeled Johnson as unfit for recruitment. The National Black Panther Party said that Johnson was effectively blacklisted from Black nationalist and liberation groups.

Although he continued to attend protests, Johnson acted as a loner, as he was never officially affiliated with any Black national organizations.

Moore speculated that after being ostracized by both the Army and the national Black groups he desperately wanted to join, Johnson found himself in a disturbed mental state. Then after the shooting of Alton Sterling and Philando Castile, Johnson experienced a psychological break.

Although many people who knew Johnson believed he had some issues boiling beneath the surface, most of them never thought he was capable of such terror.