Assuming, of course, that the murder occurs on US soil.
A US citizen, OTOH, can be charged with US crimes, and has to follow (some) US laws, regardless of where on the planet the US citizen happens to be. Tax laws, registration for the draft, and some sex laws have that property; so the US citizen is "under more jurisdiction" (for want of a better way to say it) than the illegal alien is.
And if a diplomat can be expelled, does not that make the diplomat "subject to the jurisdiction" too? Albeit just a little bit.
I think there are cases where diplomatic immunity has been waived after the fact, by the home country, so that a murder charge can proceed. Ex-Diplomat Gets 7 Years for Death of Teen in Crash - latimes - December 20, 1997
At any rate, the issue as neat, tidy and simple as many people think.
>> I think there are cases where diplomatic immunity has been waived after the fact, by the home country, so that a murder charge can proceed. Ex-Diplomat Gets 7 Years for Death of Teen in Crash - latimes - December 20, 1997 <<
Yes, I remember the case. It was extensively covered in the Wash DC local media. The crime was so bad that the home country (Republic of Georgia) revoked the guy’s diplomatic immunity, after which he definitely became subject to the USA’s jurisdiction.
Don’t remember the outcome, but presumably he went to prison, with the prospect that he’d be deported whenever the prison term ran out.
Or maybe — as can happen — he was sent back to Georgia to serve his prison term in his home country. I guess he’d do OK there if his family had enough dough to bribe the warden and guards. But otherwise, a prison in the USA might be “nicer” so to speak.
>> And if a diplomat can be expelled, does not that make the diplomat “subject to the jurisdiction” too? Albeit just a little bit <<
Yeah, but really grasping at straws. It’s extremely hard to imagine that any court — much less the SCOTUS as presently constituted — would ever agree to your point.