The woman suspected of masterminding the grisly Philadelphia dungeon where four mentally challenged adults were chained up in squalor and starved has been deemed competent to stand trial, RadarOnline.com has learned.

Linda Ann Weston was determined to be “partially mentally retarded” and showed signs of paranoia by the court on Wednesday, but not enough to prevent her from facing a jury for her string of abusive charges, reported FoxNews.com.

As RadarOnline.com previously reported, the sinister 51-year-old was arrested last month and charged with criminal conspiracy, aggravated assault, kidnapping, criminal trespass, unlawful restraint and false imprisonment after three men and a woman were found chained in a Tacony, Pennsylvania house.

Police in Philadelphia have arrested a fourth person on Wednesday in connection with the kidnapping of four mentally challenged adults who were found chained in a basement last weekend, RadarOnline.com has learned.

Jean McIntosh was taken into custody and charged with a string of offenses including kidnapping, conspiracy, unlawful restraint, false imprisonment, and assault, the Philadelphia district attorney's office confirmed according to a report on CNN.com.

The latest suspect is the 32-year-old daughter of the alleged ringleader, Linda Ann Weston, 51, who was arrested along with Eddie Wright, 49, and Thomas Gregory, 47, on Saturday after three men and a woman were found chained in a Tacony, Pennsylvania house.

The ramshackle cellar looks like it's been decorated for Halloween but the grimy room is actually a real life house of horrors where four mentally challenged people were chained-up and starved, and RadarOnline.com has the grisly photos.

Phildelphia police searched the converted movie house in the Tacony neighborhood of the city on Saturday and discovered the captives chained up and lying in their own filth in a 10-by-15-foot boiler room, which contained bathroom buckets but no food and didn't have ventilation or sunlight.

PHOTOS: Inside The Philadelphia Dungeon Of Horrors

As RadarOnline.com previously reported, suspects Linda Ann Weston, 51, Eddie Wright, 49, and Thomas Gregory, 47, are now facing a string of charges including criminal conspiracy, aggravated assault, kidnapping, criminal trespass, unlawful restraint and false imprisonment after three men and a woman were found chained in a Tacony, Pennsylvania house.

A Philadelphia woman accused of locking four mentally challenged adults in her basement so she could steal their social security checks may have committed similar heinous crimes before, RadarOnline.com has learned.

Linda Ann Weston was arrested along with two accomplices on Saturday night and now police have discovered documents belonging to up to 50 other potential victims in Florida, Virginia and Texas, ABCNews.com reported.

The 51-year-old and her alleged co-conspirators, Eddie Wright, 49, and Thomas Gregory, 47, are facing a string of charges including criminal conspiracy, aggravated assault, kidnapping, criminal trespass, unlawful restraint and false imprisonment after three men and a woman were found chained in a Tacony, Pennsylvania house.