Go to this link, and scroll down to the second picture from the bottom: (I'm not computer literate enough to cut and paste it)
http://www.jameson245.com/garotte.htm
Also, Lou Smit, who was the most experienced investigator on the case said this on Larry King:
KING: You never found a case where a mother did that.
SMIT:
Never recorded history where a family member -- a mother or a father has garroted their child. Child strangulation is very rare. Usually when a person is involved in the death of their child, the child is hit on the head or pushed into something, to take -- to take a piece of rope, fashion a garrote, put it on the child's neck, she is definitely struggling at the time that this is put on the neck, there are fingernail marks in her neck, which suggest very strongly, that she was awake, when this happened.
John Meyer, the medical examiner that performed the autopsy, didn't get everything right--he missed the stun gun marks. He noted abrasions, but didn't know that they were stun gun marks. Likewise, he didn't specifically call out the scratches on her neck. I'm not aware one way or the other if it's ever been publically stated that JBR's skin was under her nails. There was foreign DNA, which ultimately matched DNA in her panties.
The sheets were not changed....at least not on the 26th. That seems to be an established fact. Also found on the sheets were fibers that were found in the paper bag that held rope in John Andrews bedroom....and ligarture cord fibers. Patsy could have changed them since LHP was there--or LHP got it wrong. I'm not aware of a bloodstain being found on the pillow.