LE MARS, Iowa (AP) — Authorities have charged an 81-year-old man with first-degree murder in a deadly Iowa shooting. A complaint and affidavit filed Thursday in Plymouth County District Court said Thomas Knapp, of Merrill, confessed to shooting 51-year-old Kevin Juzek in May during a disturbance at their home. The Sioux City Journal reports that Knapp previously pleaded not guilty to domestic abuse charge in the case.

Authorities responded after his wife called 911 to report that her husband was assaulting her and her son with a stick and also pointed the shotgun at her. She also said Juzek, who also lived in the home, had just been shot.