In this case there would have to be a Post Mortem. She died of a sudden or unexpalined seath. Falling down the stairs would not be sufficient. A post mortem will establish how she died. I.e did she have a heart attack, stroke, seizure, or the like befor she died. Did she die as the reult of a frature incurred during the 'fall'. It is the law that a PM will be carried out to establish the cause of death. The death occurred in a factory of an otherwise healthy woman. It will be treated as a suspicious death until the PM and subsequent inquest are held.
The CONners are not out of the would yet.
Rigormortis sets into a body quite soon after death and will then after a period of hours completely disappear. The PM will give them an approx time of death. Blood tests wil measure things like the amount of oxygen in the blood which is also an idicator of time of death, it will check for toxics in her system.
A PM will show if there are any other bruises on her body and will seek and explanation for them.
What I think will be the CONners undoing is the fact so many people are involved and they will never all keep their stories straight. Vicky being an immigrant from Poland will fear the police and drop them all in it by telling the truth. (remember you heard it here first folk). Sally will also feature in it when the truth comes out. I feel this story will form the basis of Paul's departure later this year.
Love many, trust few, always paddle your own canoe