A 12-year-old boy in Ohio is dead after reportedly fatally shooting his 9-year-old half-brother and then himself.

Jackson County Coroner Gregory Hawker on Wednesday said that autopsies showed that 9-year-old Blake Campbell died almost immediately after being shot in the head with .44-caliber revolver. His half-brother, 12-year-old Austin Wiseman, then put the gun under his own chin and pulled the trigger, according to The Columbus Dispatch.

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The children were at home alone when the shootings occurred on Tuesday. They were later discovered by their grandparents.

It was not immediately clear why Wiseman had shot Campbell. A full autopsy was expected to be completed in about six weeks.

“I know Austin was very loving and caring,” relative Shirley Causey told the Dispatch. “In my mind, I’m just thinking that maybe Blake found the gun and Austin tried to take it away from him and it went off. He didn’t do it on purpose; I don’t believe he would have done it on purpose. He loved his brother, I know he did.”

Watch this video from WSAZ, broadcast June 27, 2013.

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Watch this video from WCMH, broadcast June 27, 2013.

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