Osama dead?

I just read that Osama Bin Laden is dead and has been dead since right after September 11 th. I heard that he wasn't killed by the USA but by his own son who has taken over as the leader. The republicans knew about it and are keeping it a secret until the day before the Presidental elections so it will look good for them. Cause they are afraid that they will lose the election to the Democrats. If you have away to look at the videos that were posted in 2003 you will notice that Osama has a grey beard and then if you look at the video from 2007 his beard is no longer grey, but black. This might just be a rumor but someone should look into it. I believe it is true cause I remember looking at the videos and it just doesn't add up.