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.

Judge Kevin Mullins, 54, was allegedly shot multiple times by Letcher County Sheriff Shawn M. Stines, 43, according to Kentucky State Police. Mullins was pronounced dead at the scene. Stines was taken into custody at the scene without incident, police said.