ATOKA, Okla. (AP) — The Oklahoma State Bureau of Investigation has arrested a 20-year-old man following the death of his 55-year-old father from a rifle wound.

OSBI investigators say Wyatt Arp was arrested Monday on a complaint of first-degree murder in connection with the death of his father, Douglas Arp. It was not immediately clear if Wyatt Arp is represented by an attorney.

Douglas Arp was fatally shot on Thursday inside his Atoka residence. Officials say Wyatt Arp told investigators he dropped his rifle, causing it to fire a round that struck his father in the chest.

Investigators questio...