Thanks to E! Online for the following scoop on Criminal Minds:

There's great news on the way for Hotch fans: Episode 18 will center on a resurgent serial killer known as the Watchman.

Turns out Hotch covered the original case when he was just a young agent. Viewers will receive some insight into how this character grew into the emotionally-unavailable man he is today.

Thomas Gibson plays Hoch on Criminal Minds.

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