From a practical point of view, the police in the UK are far too starved of resources to investigate mysteries where there is no realistic prospect of prosecuting anyone for a crime. To do this would require dropping higher priority investigations.

I also think that it would be overreach for the police to do this kind of thing. The UK is not a police state (in theory at least). The police have no business investigating anyone who they don’t suspect of having committed a crime. In this case, of course, there were reasonable grounds for suspicion and so there was an initial investigation. However, once it became clear that there was no realistic prospect of proving that anyone in the apartment was legally responsible for the young man’s death, there was nothing for the police to do.

It's easy to get sucked in by the fascinating story told in the article and forget that legally speaking almost everything turns on the last few minutes before the man jumped – about which we know almost nothing. If he didn't jump in response to an imminent threat to his life, then good luck making any kind of criminal case.

>To avoid a scenario where 'clever people' wander around the country leaving a trail of bodies in their wake because they keep covering their tracks effectively.

In this case the only person who could realistically be guilty of murder or manslaughter (Sharma) is now dead. So we need not fear that he will kill again.