A Montgomery police officer is accused of sexually assaulting a woman while on duty.

Morris Williams Jr., 23, of Millbrook was arrested Tuesday and charged with sodomy second degree, court records show. He is being held in the Montgomery County Detention Facility on a $30,000 cash bond.

Court documents show Williams is accused of engaging in "deviant sexual intercourse" with a person "incapable of consent by reason of being mentally defective."

The alleged incident occurred Monday between 12:30 and 2 p.m. Where the incident occurred was redacted from court documents.

Montgomery County District Attorney Daryl Bailey said the reported incident occurred at a private residence.

"I don't think there was any evidence (the officer and the victim) knew each other prior to this incident," he said.

Bailey said he didn't know if Williams was responding to 911 call at the time.

Montgomery Department of Public Safety spokeswoman Martha Earnhardt declined to release the circumstances of why Williams was at the residence.

The Montgomery Department of Public Safety issued a statement Wednesday morning saying the Montgomery Police Department has initiated disciplinary proceedings against the officer.

Williams, who graduated from the police academy in 2013, has been placed on administrative leave.

The Montgomery Police Special Victims Unit is investigating.

Williams was the second Montgomery police officer arrested on Tuesday.

Off-duty officer G.T. Farris, 22, resigned from his post after being arrested early Tuesday for felony leaving the scene of an accident.

The charge stems from a crash between a 2006 Ford Escape and a 1990 Honda Accord that occurred at approximately 3 a.m. at the intersection of West and Fifth streets in Montgomery. Police say the Ford left the scene and was abandoned near the crash site.

Police learned the Ford was registered to Farris.