Banita Jacks was accused of murdering her four daughters, then living with their corpses for several months -- which weren't discovered until she was about to be evicted. One girl was apparently stabbed to death. The other girls were strangled. She reportedly told authorities that her daughters were possessed by demons.
One of the big questions after the bodies' discovery was how four young people could basically disappear without schools, social workers -- SOMEBODY -- noticing that something was wrong.