A state prison guard is facing charges that he sexually assaulted an inmate at the Women’s Community Correctional Center in Kailua.

An Oahu grand jury returned an indictment Thursday charging Irwin Ah-Hoy with two counts of second-degree sexual assault and two counts of third-degree sexual assault.

Deputy City Prosecutor Keith Seto said Irwin directed other staff at WCCC to send the inmate to him where he forced her into a staff-only bathroom and sexually assaulted her. Seto said DNA evidence recovered from the inmate matched that of Ah-Hoy. He said Ah-Hoy also subjected the inmate to sexual contact.

Ah-Hoy continues to be employed by the state Department of Public Safety while the department’s internal affairs office and Honolulu police investigate the allegations, said DPS spokeswoman Toni Schwartz.

The inmate is in custody serving a five-year prison sentence for drug and drug paraphernalia possession and for auto theft.