He will get life in prison under protective custody with free food, cable, etc.
In a just world, his unburied corpse would be swinging on a gibbet until it disintegrates.
We just blabber, including me. Nothing will ever come of our outrage. It accomplishes nothing.
The chains and manacles below high tide on the old wharf along the Thames in London was a proper example of punishment by death for all to see. The offender was chained and the tide covered him, he drowned and then the crabs would consume the body. Some were recovered and dipped in tar before the crabs ate them and then the preserved corpse was hung from the side of the building for passing ships to see.
The chains remain on the wall of the wharf. I am amazed they have not corroded to nothingness. Maybe they have been replaced over time. I don’t know.
There were not a lot of crimes or mutinies on the high seas of the British Merchants or the Navy... they were unusual and that is why they are memorialized in story.