

Case by case basis.
So much would depend on the countries involved, and their current relationships.
Let’s say it’s a former Russian citizen who kills Putin in the USA. The new Russian leader might want to have the killer tried in Russia, or they might want to throw the whole thing to the Americans. Legally, if the murder takes place in the USA, it’s the duty of the individual state to deal with it. But if the US President declares it an act of international terrorism, they could push through sending him home.
That’s not even getting into how the murder was done. Putin would have his own security team, plus Secret Service protection, so how did the killer get past them? Was there a conspiracy?
There’s no single answer possible.
Back in 1960, the US minimum wage was $1.00/hour and the average house was $11,000.00
In those days, pretty much any union job would support a family of four with a decent house and money to send the kids to college.
By those standards, today’s ‘middle class’ is poverty stricken.