Is there any sold evidence that OBL has been killed and dumped at sea?

No. There is no solid evidence. And they got his dna confirmed by dna on record from his dead sister. He has like 40-50 brothers and sisters. How can they single out that it is Osama? It's a ploy to boost Obama's ratings for re-election in 2012. I don't believe it. If they really had him, they would be proud to prove it.