GOUVERNEUR — A third Gouverneur Correctional Facility employee has been accused of having sex with inmates.

Rachael S. Patterson, 32, Ogdensburg, was charged Monday with three counts each of third-degree criminal sexual act and official misconduct, two counts of second-degree sexual abuse and one count of petit larceny. She worked as a calculations clerk at the medium-security state prison.

She is accused of having oral sex with two inmates on numerous occasions from May to August, along with allowing two other inmates to fondle her on several occasions. She also is accused of stealing items from the commissary and providing them free of charge to several inmates.

Ms. Patterson was arraigned in Canton Town Court and released to probation supervision.

She has been with the state Department of Correctional Services since December 2003, corrections officials said. She is expected to be suspended without pay.

Last month, Laura E. Doug-lass, 38, Potsdam, and Lisa A. Vaughn, 41, Carthage, were charged with having sexual intercourse with Gouverneur Correctional Facility inmates.

Mrs. Douglass was charged with 11 counts of third-degree rape and single counts each of third-degree criminal sexual act and first-degree promoting prison contraband, state police investigators said. She worked as a principal account clerk at the prison. She was accused of having sexual intercourse and oral sex with an inmate on numerous occasions from December 2007 to September.

Ms. Vaughn was charged with 16 counts each of third-degree rape, third-degree criminal sexual act and official misconduct and four counts of second-degree promoting prison contraband. She was a laundry supervisor at the prison. She was accused of having sexual intercourse and oral sex with four inmates, which apparently started sometime in 2006. She also is accused of sneaking food, cigarettes and postage stamps to inmates.

All three women were charged with third-degree rape or third-degree criminal sexual act because by state law, inmates are incapable of giving consent, investigators said.

The state police and state Department of Correctional Services inspector general's office conducted the investigation. A confidential source tipped off authorities about the incidents, investigators said last week. The investigation continues.