Ahmed Abu Khattala was the first person charged and prosecuted in the attacks in Benghazi, Libya, which left four Americans dead, including an ambassador.
American officials paid the informant after he helped build a case against Ahmed Abu Khattala, a suspect in the 2012 Benghazi attacks, and orchestrate his capture.
Wearing disguises in the courtroom, the C.I.A. officers described how their rescue team tried desperately to find the American ambassador and later came under mortar attack.
At the second day of the trial of a Libyan man accused of helping orchestrate the 2012 attacks, witnesses described trying to survive and escape.
A survivor of the 2012 Benghazi, Libya, attacks described the assault on a villa that left two Americans dead as lawyers clashed over the defendant’s role, if any.
A suspect in the attacks, Ahmed Abu Khattala, will go on trial on Monday in the latest test of the civilian court system’s ability to handle high-profile terrorism cases.