OTTAWA, Ohio (AP) — A Scotsman released from prison four years ago after spending two decades on Ohio's death row is heading back to prison.Ken Richey was sentenced Monday to three years in prison for threatening a judge in the Ohio village of Ottawa who prosecuted his original case.Richey pleaded guilty to a felony retaliation charge last month. He says he'd been drinking heavily before he left a threatening phone message and regrets making the call from his Mississippi home last New Year's Eve.Richey was on death row for 21 years after being convicted of setting a fire that killed a 2-year-old girl in 1986.A U.S. court determined his lawyers mishandled the case and he was set free in 2008 under a plea deal.