https://chainalysis.com/

But how would you know that guy is hitman and has killed someone and has received coins on that address. The crime and bitcoin address should be connected and should have been in public knowledge or atleast in the knowledge of tool you are using.

Taint analysis can help you only with bad addresses which are already identified as connected to some so called crime.

Will surely try to put some points later today as I will have to use blockchain.info taint analysis tool ( Never used it before )

Regards