DULUTH, Minn. (AP) — Police have closed the case of a Duluth man who was found dead in January from an apparent head injury, after prosecutors say the man accused in his death acted in self-defense.

WDIO-TV reports that 33-year-old Dave Matthew Walker was found dead near 2nd Avenue West and 3rd Street on Jan. 17.

Officers initially arrested a 53-year-old man in the case, but he was released from jail without being charged.

Police said Friday that the St. Louis County Attorney's Office has determined the man acted in self-defense.