State police officials say a trooper fatally shot a distraught man after he advanced with a large knife in Ulster County.

They say 41-year-old Daniel McAlpin was inside his home on Clark Road when troopers and the mental health crisis team tried to get him to drop the knife.

According to a release from state police:

“Law enforcement officers attempted to engage McAlpin in conversation, however, he was non-compliant and ignored repeated commands to drop the knife. In an attempt to take McAlpin into custody, a Trooper tased him, however, he advanced towards the officers while threatening them with the knife. A second Trooper then discharged his issued firearm, striking McAlpin who was pronounced deceased at the scene.”

The State Attorney General's Office is investigating the incident.