If murder, it does seem deliberate ... from something happening while she was on the phone with her husband, to the phone being 9 feet from the top of the stairs, and the only thing she hit on the landing was the lamb piggy bank ... with her face. From the landing, there is evidence down the stairs and in a nearby corner of the basement that could be accident or murder.
Without knowing what type of pants she was wearing (e.g.: jeans, sweats), hard to say why they were down - since the theory for
back of head injuries seems to be that she bounced down the stairs on her head.
I don't think the "fancy panties" should be set aside as 'red herring'. After 6 years of marriage, her husband knew that the underwear she was wearing when she died was "fancy" and not something he was used to. It stood out because it was so unusual.
Did she have a migraine on Friday, or was she driving around running errands? Both can't be true.
Amanda was kind to people less fortunate, per her obituary. She could have befriended someone with the belief that she was safe with that person. Instead, while she was on the phone with her husband - giving no indication that anything was wrong, something happened that left her bleeding out on the basement floor.
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