Muchai was assassinated. For parliamentarians to be killed in this way is shocking. It is not important if you agree with a politician, a journalist, anyone. You do not kill them; you argue their points, maybe.
The death of Mr Muchai was reported in the international press. Wikipedia does not have an article. When someone finds it relevant enough they may write an article about him. They may call it "the assassination of George Muchai" At least there is already a Wikidata item for him.