If an astronaut murdered a cosmonaut on the ISS, could he be prosecuted

Question

ie. Do the laws of the U.S. or Russia apply on the International Space Station ? What about the Moon or someplace else in Space?

Answer 1

Actually, there's no real answer on that yet. There are a couple of agreements that establish working groups to figure out such things, but nothing specific yet. Most people think it would be in the International Criminal Court.

Answer 2

The laws of the nation that sent the astronaut to the space station apply.

Answer 3

International law.  The same as a ship at sea.  The space station is just that, a ship at sea.