A former South Korean spy chief is heading to prison after being found guilty of ordering an illicit online campaign to support then-ruling party candidate and current President Park Geun-hye ahead of the 2012 presidential election.

The Seoul High Court sentenced Won Sei-hoon to three years in prison Monday for violating an election law and another law banning the National Intelligence Service from engaging in local politics.

A district court last year handed Won a suspended prison term when it convicted him of violating only the law banning spies from politicking.

Park beat opposition candidate Moon Jae-in by a million votes and took office in early 2013 for a single five-year term.

It's not clear if or how the online campaigning affected the election.