FBI suspected that Ali's KO of Liston was fixed

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Gun to my head I'd say it was. Like Smashup said, the mob had total control of Liston and could have had him lose any way they wanted. The punch may have been much better than it appears, but either way I think Liston just decided he wasn't getting up. Whether the fight was fixed for that round, or what affect the punch actually had, who knows. Nobody even knew how old Sonny was at that point, and he had quit in the first fight so no outcome can really be ruled out.

I'm more interested as to whether Listons death was a cover up. He was found dead in his home of a "heroin overdose", with no apparent history of using the drug, no paraphernalia present and apparently the man had a serious fear of needles.

You can snort Heroin lol and smoke it I believe. But you can definitely snort it.

Yeah I'm aware of that, apparently they pointed to injection sites on Listons arms as evidence or something though. He'd been in a car accident shortly before his death and was given an IV, so they could have been from that. Not saying he didn't just develop a habit and OD given his career was over, but it's also possible he was taken out.