When the deputy arrived, he saw the man approaching two people with a large wooden stick, according to Sheriff Darren Popkin. When the deputy intervened, the deputy and the man began fighting, and the man struck the deputy at least once with the piece of wood.
The deputy attempted to deploy his Taser, according to Popkin. When he wasn't successful, the deputy shot the man, the sheriff said.
The man was pronounced dead at the scene, and the deputy was taken to a local hospital for treatment. He's expected to be OK. Sheriff Popkin said he's expected to be released from the hospital Saturday.
The sheriff's deputy has not yet been identified by the sheriff's office, nor has the man who was shot. It's not clear yet what was causing the man to act erratically.
Montgomery County Police are handling the investigation. Sheriff Popkin said the deputy was wearing a body camera, but did not say whether it was recording at the time of the incident.
The deputy will be placed on administrative leave once he's released from the hospital while the investigation continues.