When his body is repatriated back to the UK he will have another post mortem, the relevant paper work and files will be shared with the UK, but after the British do their examination if they think anything is suspicious it will be passed to the police. And finally there will be an inquest.
Once on British soil, as long as we have all of him and all their early samples it should be simple to rule as an accident (obviously listening all his injuries as with any post mortem) or say otherwise.
It appears to me that he was not be very good at choosing his friends, they have all been atrocious, his family members may be grieving but just appear so greedy. I didn’t think I would say it but I actually feel sorry for the Jay, he doesn’t seem to ever have had someone looking out for him.