Shot 07/05/2011.## MUNHALL, Pa. — A woman and her boyfriend were arrested on charges of false imprisonment after her 6-year-old son was kept in a locked room for most of the past few months, Allegheny County police said.  Robert Guyer Chrystal Plesniak Chrystal Plesniak and Robert Guyer are also charged with aggravated assault and criminal conspiracy, police said. The criminal complaint identifies the boy as "John Doe" and says he was kept in a room at his home on Longfellow Drive in Munhall and was only allowed out to go to the bathroom. The boy was struck with a belt when he defecated on the floor "because he couldn’t hold it any more," police said in the complaint. From the affidavit: "Doe reported that he is locked in his room all the time and the reason he is locked in his room is so he doesn't get into stuff. When asked who locks him in his room, Doe stated his mother, Chrystal Pleniak, and dad, Robert Guyer, both do. When asked how long he is locked in his room, Doe stated, 'Forever, I never come out.' Doe also reported that he is hungry, and not allowed to eat. Doe stated, 'If I knock on the door to get Mom, she lets me go to the bathroom, but I can't drink any water.' " A police investigation began after the boy was taken to Children's Hospital of Pittsburgh because his grandmother found bruises and welts on the lower half of his body, according to the affidavit. Both suspects are scheduled for a preliminary hearing before District Judge Thomas Torkowsky on Wednesday afternoon.##