I think, while Deidra was on drugs, maybe, she was put into a drug rehab, mental hospital or something where Angela aka Mary Alice was a nurse. Deidra was pregnant at the time and had the baby while there. Angela stole the baby with Mrs. Huber's sister's help. Angela & Mrs. H's sister told Deidra the baby died. Deidra found out the truth after a year or so and went looking for her baby and tracked down Angela and Paul. That's when one of them killed her. They changed Dana's name to Zach, Angela to Mary Alice and left town. That's what I think but who knows, the show has a way of surprising us.
Tom in the thong - LOL. I can't wait for the truth about them.
7 more days - sigh.