How do you think the Sergeant that killed the Afghani civilians should be dealt with?

In light of recent events in Afghanistan involving a crazed Sergeant and his mindless killings of innocent people how do you think he should be tried and what do you think the fallout will be. There is talk of him being hanged. As a UK citizen i’m interested to here what the folks in The USA think. I am also quite surprised that there is no other questions on this terrible event given it’s the biggest news event this year.