Asalaamu alaikum,
"Isaac de Rivas was a Swiss inventor who, in 1805, was the first to make a car powered by an internal combustion engine. That was an accomplishment in and of itself, but what did the engine use as fuel, since gasoline wasn't invented till the 1870s? Amazingly, the first automobile ran on HYDROGEN extracted from water."-water powered car dot com
As for statement that the US probably killed him (meaning the scientist you are thinking about).....I'm amazed that you said that. Unless you have proof of the act, then I would remind you of this Hadith..
Volumn 003, Book 043, Hadith Number 629.
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Narated By Abu Huraira : Allah's Apostle said, "Whoever has oppressed another person concerning his reputation or anything else, he should beg him to forgive him before the Day of Resurrection when there will be no money (to compensate for wrong deeds), but if he has good deeds, those good deeds will be taken from him according to his oppression which he has done, and if he has no good deeds, the sins of the oppressed person will be loaded on him."
Why would they kill someone as early as 1805? These carbon based fuel problems did not exist then.
Wa'alaykum salam.