Osama Bin Laden survived for years with a $20M bounty on information leading to his death or arrest, which presumably was also payable to his freelance assassin

Osama Bin Laden survived for years with a $20M bounty on information leading to his death or arrest, which presumably was also payable to his freelance assassin. He was ultimately killed by US soldiers themselves. No idea if any informants claimed the bounty. Does anyone know this?