State Attorney General Mike DeWine’s office had investigated the March 2012 death of Jacob Limberios and had called a grand jury to consider testimony.
Authorities said Wednesday that the grand jury declined to bring charges against anyone in the case.
The Sandusky County coroner had ruled the death a suicide but also said the teen might not have known the gun was loaded.
His parents fought that ruling and hired their own forensic pathologist to do an autopsy. He concluded the death was a homicide after the teen’s body was exhumed last fall.