Question: So, I heard of such cases from some countries in which people get murdered but due to influence from powerful people, it gets labeled as "suicide" in the media and similar sources even with cases that have proof that it in fact was a murder.

Is there any English word that summarizes this "made-up suicide" that may or may not be valid in the following example cases?

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> They brutally [word]ed him.
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> Yesterday, x got brutally [word]ed by y.
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> I am certain that this is not a suicide, this is rather a [word].
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> This begs the question, how can we prevent this inhumane spree of [word]s?
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At the moment, I tried briefly searching it inside a PDF copy of the Oxford Dictionary 2018. I haven't really considered any word for this yet, I don't think any word that is currently in my vocabulary fits the definition, or I fail to remember it right now. I also don't have a "best word" criteria, so simply what matches my sample cases the most will be chosen. Non-compound words would certainly be highly preferred, but compound words are also allowed.

Answer: 
There is a transitive use of *suicide* as a verb that may be entering mainstream usage (see [this English.se question](https://english.stackexchange.com/questions/451191/transitive-use-of-suicide)). It can either mean "to drive to suicide" or "to kill [someone] and make their death appear to have been a suicide rather than a homicide" ([Wiktionary](https://en.wiktionary.org/wiki/suicide#Verb)).

In the second sense, it has apparently been used as far back as 1898, and would fit in either of your first two sentences. For the noun form, you would need either quotes to indicate that the word "suicide" is not to be taken literally, or a phrase that explains what's happening.
The best that can be hoped is an expression.

* *murder covered up as (a) suicide*

([ref.](https://www.google.fr/books/edition/Reserved_For_Murder/ALvoDwAAQBAJ?hl=fr&gbpv=1&dq=%22murder+covered+up%22&pg=PT121&printsec=frontcover) And if we announce a murder covered up as a suicide, a lot of people will just think it's another death on the reserve and go on about their day.

([ref.](https://www.google.fr/books/edition/Murder_Through_Disabled_Access/uZt_5Spsy2MC?hl=fr&gbpv=1&dq=%22murder+covered+up%22&pg=PA126&printsec=frontcover)) Immediately Bruce is interested because it fits the pattern—a murder covered up as suicide and the connection to gay men.

([ref.](https://www.google.fr/books/edition/Chinese_Spies/rverDwAAQBAJ?hl=fr&gbpv=1&dq=%22murder+covered+up%22&pg=PA88&printsec=frontcover)) When the autopsy showed that she had been the victim of a murder covered up as suicide,