He might harvest her organs first, avaricious little creep that he is. And yes, I agree with your conclusion. All murderers like to at least try to cover their tracks.
Don't think he would -- no use for most transplants due to her long illness and lack of more than just rudimentary medical care. No, he just wants the "evidence" disposed of.
He knows there's a chance the doctors doing the retrieval might, just might, be curious enough to do a little investigation on their own and oops, there's the prove in the report or at least everyone in the OR would know the truth. No, his only chance is to turn all evidence to ashes immediately.
He might harvest her organs first, avaricious little creep that he is. And yes, I agree with your conclusion. All murderers like to at least try to cover their tracks.
Cant use organs from a starved and dehydrated person. They are ruined.