In a tragic incident that shocked the small community of Letcher County, Kentucky, Sheriff Shawn M. Stines allegedly shot and killed District Judge Kevin Mullins inside the courthouse on Thursday.

The two had eaten lunch together earlier that day before a reported argument in the judge’s chambers. Mullins, a judge for 15 years, was found with multiple gunshot wounds and pronounced dead.

Stines, now charged with first-degree murder, had been responsible for the judge’s personal security, CNN has reported.

The motive remains unclear, and the investigation is ongoing. Mullins is survived by his wife and two daughters.

Written by B.C. Begley