WATCH: Under the radar: A cop’s 20-year secret exposed in northwest Arkansas, Part 2

As evidence piled up, Grant Hardin pleaded guilty to the murder of James Appleton in exchange for a 30-year prison sentence.
 
As Hardin was booked into a state prison, the Arkansas Department of Correction submitted his DNA sample into a database, which then unlocked a key to a cold case: a teacher’s rape in Rogers in 1997. It sent shockwaves through the community.