BOISE, Idaho (AP) — A man serving time on a drunken driving charge was beaten to death in an Idaho prison, and officials say his cellmate — who was convicted of killing his three small children more than a decade ago — is a suspect in the case. Idaho Department of Correction spokesman Jeff Ray wrote in a prepared statement that staffers at the prison south of Boise learned Friday that Glenn Arthur Cox had been assaulted. They found the 52-year-old Cox unresponsive in the cell he shared with 45-year-old James Junior Nice. Medical staffers attempted to resuscitate Cox, but he was pronounced dead a little less than an hour later.