I have to agree with those of you that don't believe drugs were involved in killing her. It's possible but the drugs mentioned earlier in this thread would be difficult to get. (animal euthanasia drugs). Also, the fact that he solicited someone(s) 3 different times, tells me he didn't want to get his 'hands dirty'. But I'm thinking he couldn't find anyone and in his mind, time ran out. So, he had to do it himself. He could have easily hit her over the head (some blood spatter) and then strangled her to finish it. After death, loss of faculties. Sorry for being morbid.. Didn't like tying it.
Side note: he could have used any number of drugs used on horses as a calming agent.. However, then there would only be loss of faculties. I feel like with LE taking pieces of her home as evidence, they found a significant amount of physiological evidence. That was not easily seen by the naked eye. All of this is MOO. And I still stand by him being a HUGE LIAR.
One last thing: I too believe he killed her when he went to pick up the baby. He's disgusting.