A fourth defendant has pleaded guilty to charges stemming from the alleged torture of a young black woman who authorities say was held captive for days at a trailer in Logan County.

Frankie Brewster of Big Creek faces 10 to 25 years in prison after pleading guilty Wednesday to second-degree sexual assault.

In exchange for her plea, Logan County Prosecutor Brian Abraham says charges of assault during the commission of a felony, kidnapping and conspiracy were dropped.

Brewster was accused of forcing 20-year-old Megan Williams to perform oral sex on her.

Authorities say Williams was held captive at Brewster's trailer in Big Creek, where she was forced to eat animal feces, sexually assaulted and stabbed. She was rescued September 8 after an anonymous caller alerted police.

Brewster is one of seven people charged in the case. Three other defendants pleaded guilty earlier this month.

Williams' father, Matthew Williams, says the family won't discuss the plea agreements until the case is resolved.