We know their lifes, but what about their deaths?

[Ludens]

Alexander wasnt on a campaign, he was on his way back to Babylon. His soldiers refused to go any further. He was forced to turn back. No one knows for sure what he would have done next. But most likely he would have raised another army and marched back to india. I dont think alexander cared about carthage. He might have even sent an army to italy, because his uncle alexander died there. Just imagine if he would have kept going into india and beyond.

Not quite. He reached Babylon before his death, even before falling ill, though I gather his constitution did suffer from his desert ordeal and the fighting that preceded it. But Alexander was not the type to sit still, so he planned another campaign. When his life-long friend and presumed lover Hephaistion died, he was so struck with grief that he ordered the walls of Babylon painted black and tried to get him deified. The cult of Hephaistion never really took off, I presume because Alex himself was quite quickly deified (and dead) afterwards and many people considered praying to him a better bet.

Viriathus is the leader of the iberian resistance against rome. He was the king of the lusitani (I think), and commanded succesfull raids and ambushes against roman armies that kept them from conquering the iberian peninsula so quickly. The romans bribed some of his officials to kill him, and when they took his head to the romans, they said "Rome don't pay to traitors". I think that the roman general was cornelius scipio, but I'm not sure.

I think it was one of the predecessors of Scipio the younger. As I recall it, Viriathus was part of a delegation of noblemen that had been attacked under truce by the Romans. Viriathus managed to survive and sought vengeances by rousing the Lusitanian tribes. He proved to be too elusive for the Romans to catch, so he was killed like you described. Unfortunatly for the Romans, Iberian resistance did not end with his death. IIRC yet another Roman general broke the peace treaty with the Numantines, but despite the initial suprise he was defeated and Rome was at war in Iberia once more. In the end, Scipio the Younger, the hero of the third Punic war, was sent to destroy Numantia.