In Episode 4 of Chasing Chaos... WGN-TV's Joe Donlon finally tracks down Dr. Chaos...

In Episode 3 of Chasing Chaos... WGN-TV's Joe Donlon heads to Wisconsin to retrace Joseph Konopka's steps, and look for the man himself.

In Episode 2 of Chasing Chaos... find out where Dr. Chaos was when he was arrested, and how he got that pound of cyanide.

Six months after 9/11, a man with a menacing moniker - Dr. Chaos - brought Chicago's CTA system to a standstill when he was arrested with a vial of cyanide.

Six months after 9/11, a man who called himself Dr. Chaos hid a pound of cyanide underground... in a CTA storage closet... a block away from a federal courthouse in downtown Chicago. What happened next? Find out on Chasing Chaos. The four part series starts November 18.