A sex offender who moved to Muskingum county and never registered with the sheriff’s department will be spending the next ten months behind bars. Robert Washington Sr. was sentenced Monday in Muskingum county common pleas court. Washington has a prior conviction for attempted rape in Cuyahoga county in 1989. According to Muskingum county prosecutor Mike Haddox, when Washington moved to Muskingum county in March of last year he never registered, which is a requirement for convicted sex offenders. In November, a jury found Washington guilty of failing to register.