Campus police arrested 40-year-old Charles Green of Brooklyn, N.Y., on Wednesday after state police told them he did not register as a sex offender within three days of his employment. Green enrolled at the university in the spring and has worked as a teaching assistant since February.
UD spokesman John Brennan says officials did not know of Green's sex offender status until police told them.
New York's sex offender registry shows that Green was sentenced to six months in jail and 10 years probation after a 2005 conviction for second-degree rape involving a 14-year-old girl.
Green was released on bond and ordered not to return to campus until the case is resolved.
