The guy did have prior felonies, but not offenses of violence or drug offenses. Ohio law puts a person under disability, meaning they canot own or possess a firearm, if they have a prior conviction for a felony offense of violence, a prior drug conviction, have been adjudicated metally ill, or are a chronic alcoholic/drug dependant.
As a note, for all you interested people, a purely black letter reading of the law, with supporting case law, means that a conviction for misdemeanor marihuana possession as an adult pouts one under disability. Think about that little college bust for possession of a joint coming back to haunt you years later...