(7:50 p.m.) UPDATE: A 13-year-old boy has been arrested in connection to the shooting death of Gavin Freeman, 18, in Ft. Towson Friday morning, according to the Choctaw County Sheriff's office.

He was arrested around 5:00 p.m. Friday and transported to a juvenile facility where he is awaiting charges. His name has not been released due to his age.

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FORT TOWSON, Okla. (KXII) -- Deputies say 18-year-old Gavin Freeman was killed Friday morning after his younger brother's 13-year-old friend shot him while staying over for the night.

Initially it was described as an accident, now the Oklahoma State Bureau of Investigation said they are investigating the shooting.

It happened at 5 a.m. in a home near Main and Cincinnati, as Freeman was playing a video game inside the home.

Choctaw County Sheriff Terry Park says the 13-year-old was playing with a revolver when it happened.

"People, teach your children gun safety," Park said. "Don't point a gun at another person unless you plan on using it. Don't wave a gun around whether it's empty or not empty."

Freeman's body is being sent to Tulsa for an autopsy.

The case has been sent to the District Attorney's office for review.