In regars to the Woman who died of co poisoning: I believe thta was a copycat. The woman who died was an undercover police officer. The intentional victim's brother killed her because she was starting to suffer from alzeihmers. They had read about the killings and fgured this would be a good way for her to die. At least that's the impresion I got. Remember they found tears on the pillow because the lady's brother cried when he suffocated her?