What the jury has to decide is which of two stories is factual.. Either Gerard murdered Allison , or Allison killed herself.
There is no other story, no other narrative, no other scenario, no other explanation. There is no third party involvement, no wandering stranger , no abduction, no kidnapping, no accidental death, no sudden and fatal illness , no undetected lethal brain tumour, or a rapidly developing case of Ebola, no random unfortunate deadly mosquito, no mob hit, no known reason why a 43 yr old woman is dead under the Kholo bridge... last seen alive in pyjamas watching the footy show, by the husband happily ironing his shirt.
Allison didn't die of natural causes.. .. . a human hand, or hands, were indisputably instrumental in her death.. and in the location of her body. It's a matter of who's hand.
To find Gerard not guilty , it follows , and it has to follow, there is no alternative, that Allison killed herself. Both cannot be Not Guilty. Both cannot be Guilty. It's one or the other.