According to Serhii Plokhy's book about Chernobyl Legasov did commit suicide,
They must have the body somewhere to confirm.
By the way how did he commit suicide; with a gun, with poison (cyanide), ... how?
* This type of series on TV motivates us to research further on nuclear reactors, in Chernobyl and also around the world. Plus of course all the other accidents, disasters, errors, motivations, scientific research, global energy, renewable energy, wind turbines, solar power, ...all that jazz.
Chernobyl is without a doubt the most grandiose nuclear disaster...a level 7 (it stops @ #7, but they say it could be a level 8, or 9). By the way, Fukushima was also a level 7 (the worst level).
And that one too certainly deserves its own mini series...eventually; there is a lot in it that we can all learn...as in Chernobyl.
I'm not a TV guy, but this is the exception. It deserves wider exposure.