Stephen Hawking murdered due to his aliens revelations?

Conspiracy theorists claim that the british physicist Stephen Hawking was killed. In fact, this scientist revealed secrets about the existence of aliens

Ufologist Scott C. Waring explains:

Was Stephen Hawking murdered to stop him from revealing top secret information about the existence of aliens? People have been killed for much less, and its easy for someone to be killed an make it look of natural causes. However, in his case, he really did look exhausted in the last few months of his life. It was clear his ailments were taking a huge toll on him. You decide, tell us in the comments below please.

UFOMania of Youtube states:

A stunning new Foreign Intelligence Service (SVR) circulating in the Kremlin today claims it is “more than likely” that world renowned British Theoretical Physicist Stephen Hawking was murdered as his 14 March death came just 10 days after his 4 March revision to his scientific research paper titled “A Smooth Exit from Eternal Inflation?”

Source, 21th March 2018