Final answer:
Osama bin Laden headed al-Qaeda until his death and was killed by Navy SEALs in 2011.
Step-by-step explanation:
The terrorist who headed al-Qaeda until his death was **Osama bin Laden**. He carried a $25 million bounty after September 11, 2001, and was killed by Navy SEALs Team Six in Pakistan on May 2, 2011. Osama bin Laden was the founder and leader of the extremist group al-Qaeda, which claimed responsibility for the September 11th attacks.
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