Was there anything sinister about the code word prophet’s death, and if so, who was behind it? Was it ultimately caused by heavy metal poisoning as has been claimed?

This was not sinister. It was simply karma. He was working for the Cabal, so would not be targeted in that fashion. There will often be disinformation to reinforce the seemingly lofty status of such personages because the Extraterrestrial Alliance enjoys the game of tantalizing the followers with reason to have concern and what this does is cement in the minds of people that such individuals are truly special and to be highly prized and that you are lucky to have them in your midst, and that further increases interest in all would-be prophets—to take advantage of them while it is still possible and they have not been taken out. But this, of course, makes things worse for the seeker of truth because their avid interest and heightened curiosity and expectations will only make them more gullible and vulnerable to further manipulation when they follow such individuals without discernment.