Jacob Harvey

An inmate at the state prison in Florence is under investigation in connection with an assault Thursday of a staff member, authorities said.

Jacob Harvey, 20, who was convicted in Maricopa County Superior Court on charges of sexual assault and kidnapping last year, is a suspect in the assault of a worker at the Meadows Unit of the state prison Eyman Complex, officials said in a news release.

The staff member was stabbed with a pen and sexually assaulted, authorities said.