Dawn,
What if it is her and she is using the materials from Jason's company to murder women? What if it is because he was controlling, she is self concious and murders beautiful women? Maybe when Andie died she realized what she was doing to other families and stopped, divorcing Jason to rid herself of a way to kill again. There also has to be a significance of her and Jason getting back together just as Pip is threatened supposedly by the Duct Tape Killer
