DES MOINES, Iowa (AP) – An 88-year-old convicted sex offender accused of grabbing an Iowa state mental hospital worker has been found unfit to stand trial. The Waterloo-Cedar Falls Courier reports that results from an evaluation of William Cubbage were turned over to a judge Tuesday. The case is expected to be put on hold while experts try to return him to competency.

He’s charged with assault with intent to commit sexual abuse. Authorities say Cubbage grabbed the worker between the legs in January 2016 while she was showering him at the hospital in Independence.

Cubbage was convicted of numerous sex crimes from 1987 through 2000. He gained notoriety after he was accused in 2011 of molesting a 95-year-old woman at a Pomeroy nursing home, where state officials placed him without notifying other residents.