The FBI has announced a $20,000 reward for information leading to the arrest of Grant Matthew Hardin .

The backstory:

Hardin, the former police chief in the small town of Gateway near the Arkansas-Missouri border, was serving lengthy sentences for murder and rape. He was the subject of the TV documentary "Devil in the Ozarks."

He escaped last month from the North Central Unit — a medium-security prison also known as the Calico Rock prison — by wearing an outfit designed to look like a law enforcement uniform, according to Champion.

RELATED: Manhunt underway after disgraced former police chief convicted of murder, rape escapes Arkansas prison

A prison officer opened a secure gate, allowing him to leave the facility. Champion said that someone should have checked Hardin’s identity

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