There was a brief but intense firefight with Abu Ahmed al-Kuwaiti, bin Laden's courier.

CNN: The new story of the death of Osama bin Laden

She pushes one lead hardest: To find bin Laden, the U.S. needs to identify and find his most trusted courier, the real Abu Ahmed al-Kuwaiti.

WSJ: The Weekend Interview with Mark Boal: The Art and Politics of 'Zero Dark Thirty'

The first mention of Abu Ahmed al-Kuwaiti the nickname of the al-Qaeda courier who ultimately led us to bin Laden as well as a description of him as an important member of al-Qaeda, came from a detainee held in another country, who we believe was not tortured.

FORBES: Update - McCain: Torture Didn't Help Locate Bin Laden