Once the heart stops beating, blood collects in the most dependent parts of the body (livor mortis), the body stiffens (rigor mortis), and the body begins to cool (algor mortis).
The blood begins to settle in the parts of the body that are the closest to the ground, usually the buttocks and back when a corpse is supine. The skin, normally pink-colored because of the oxygen-laden blood in the capillaries, becomes pale as the blood drains into the larger veins. Within minutes to hours after death, the skin is discolored by livor mortis, or what embalmers call "postmortem stain," the purple-red discoloration from blood accumulating in the lowermost (dependent) blood vessels. Immediately after death, the blood is "unfixed" and will move to other body parts if the body's position is changed. After a few hours, the pooled blood becomes "fixed" and will not move. Pressing on an area of discoloration can determine this; if it blanches (turns white) easily, then the blood remains unfixed. Livor mortis is usually most pronounced eight to twelve hours after death. The skin, no longer under muscular control, succumbs to gravity, forming new shapes and accentuating prominent bones still further. The body then begins to cool.
http://www.deathreference.com/Py-Se/Rigor-Mortis-and-Other-Postmortem-Changes.html
Weren't there "postmortem stains" on Annas face?
And if so, that would mean she was face down for a long period of time. Then later someone must've turned her back over and made it look like she was sleeping. Covered her face with the blanket so the stains wouldn't be seen maybe?? The deed could've been done hours before the time HKS left the room. And that would explain the rigor mortis in the jaw.
Al Gore Mortis??