I don't think it was right on the Indian Govt.'s part to give a written commitment. Hundreds of people have died because of this man, ofcourse he deserves capital punishment. I don't understand why Portugal doesn't want him to get Capital punishment.
All that said, just plain ol' death is no good for this guy. I think, he should be locked in a smalll cramped room with no ventilation and no lights, 1 bad meal a day for the rest of his life. That, will be a punishment for him.