Osama Bin Laden - Murdered??

I came across this interview between "Sir David" (British news reporter / interviewer?) and Benazir Bhutto after the attack on her in October.

Roughly 6:08 to 6:20 into the video, Benazir not only says that Osama Bin Laden was "murdered" but WHO killed him.

This throws many questions into my mind.

1) If Bin Laden was killed, how come no one has peeped a word of it?
2) If it's not "the" Osama Bin Laden, leader of Al-Qaida, then who else is it? I haven't been able to find another reference to another Osama Bin Laden.

I understand that the war on terror needs to continue, even if he is dead, we should know this. If Benazir knows it, and Sir David doesn't react one bit, then we can assume that this is known throughout the world.

One point that questions the credibility of this. She refers to him as "the man who murdered Osama Bin Laden". Interesting choice of words, if she's so anti-terrorism, why would she refer to him as "murdered" as opposed to killed, KIA, etc..? Limitations in English or loose translation from a native language is possible.

Thoughts?

Post note: The name she mentioned, Omar Sheikh, is the one who murdered Daniel Pearle.