S1, E2: In 2011, a lone gunman kills six and wounds 13 in an Arizona shopping centre. Police capture a disturbed, 22-year-old suspect with a bizarre history of behaviour that should have been a warning sign of the massacre.


S1, E2: In 2011, a lone gunman kills six and wounds 13 in an Arizona shopping centre. Police capture a disturbed, 22-year-old suspect with a bizarre history of behaviour that should have been a warning sign of the massacre.