The crime stunned this rural community in northwest Georgia: The Polk County sheriff gunned down responding to a burglary call.

More than four decades later, no one has ever been convicted in the killing of Frank Lott.

The Atlanta Journal-Constitution explains why no one was ever punished in the case and how mistakes early on may have allowed the killer to walk free.

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Lee Reid, executive director of the Atlanta Citizen Review Board, speaks during a board meeting in December. The board is looking to revamp its review process in response to concerns of inaction. (Christina Matacotta / For the AJC)