Grotesque

This story about a woman who strangled an eight month pregnant woman and cut her unborn child from her womb, then tried to pass it off as her own is one of the most grotesque things I've ever read. What would possess a person to do something like this? Lisa Montgomery confessed to the crime on Thursday. Montgomery even lied to friends and her husband saying she'd given birth while shopping in the city. How would you hide that from your husband?

Montgomery contacted her victim through email about buying a dog. Did Montgomery find out the other woman was pregnant and decide to kill her and take her baby? Or was it some sort of bizarre impulse?

All I can think is that she must be insane.