According to the wikipedia article, there are multiple accounts of what actually happened. This passage taken from the wikipedia article runs counter to the claims that the US was involved and that the machine gun was operated by satellite:
According to the Jewish Chronicle, Fakhrizadeh was assassinated by the Mossad with no US involvement, and Israel had only given the US minimal prior warning. The report confirmed the Iranian claim of an automated machine gun being used, claiming that Fakhrizadeh was killed by a remotely-operated one-ton automated gun that had been smuggled into Iran piece by piece before being assembled, and which included a bomb so that it could self-destruct, though contrary to Iranian claims it was not satellite-operated.
According to the wikipedia article, there are multiple accounts of what actually happened. This passage taken from the wikipedia article runs counter to the claims that the US was involved and that the machine gun was operated by satellite:
https://en.wikipedia.org/wiki/Mohsen_Fakhrizadeh