Jacob Michuda, 4, was fatally shot in the head late Friday night while fishing from a pier at a pond near Ossian, a rural community about 15 miles south of Fort Wayne.
Wells County Sheriff Monte Fisher said on Sunday that an autopsy was performed on Saturday.
Forty-six-year-old neighbor Bruce Pond is being held on a preliminary charge of reckless homicide and is due to appear in court Monday.
Ulmer calls the shooting a “freak accident.”
It came just one day after a four-year-old boy from Cedar Lake, in northwest Indiana’s Lake County, accidentally shot himself at a suburban Chicago liquor store.
Wells County Sheriff Monte Fisher tells the Bluffton News-Banner alcohol was involved and that Pond apparently shot at a light on the pier where the father and son were fishing.
Police and medics were called to the scene at 11:07 p.m. Friday. Police said an ambulance took the boy to a hospital in Fort Wayne, where he was pronounced dead at 3:12 a.m. Saturday. Police arrested Pond later that day.