Kentucky State Police are searching for motive as they investigate the fatal shooting of a district judge by a sheriff after the two had an argument inside the judge’s chambers, according to police.

A Kentucky sheriff is facing charges of first-degree murder after shooting and killing a local judge inside his chambers last week. Kentucky State Police say Letcher County Sheriff Shawn M. Stines shot District Judge Kevin Mullins several times following a short argument.

A Kentucky sheriff allegedly shot a judge early Thursday afternoon. Here's a look at the motive behind the Letcher County shooting.