As part of the deal, the former CIA director acknowledges improperly handling classified material.
Liban Mohamed was taken into custody shortly after the FBI announced a reward for information.
The man responsible for beheading Islamic State hostages had long-standing ties to extremist groups.
Friends identified the man who beheaded Western hostages as Mohammed Emwazi, born in Kuwait.
A review of U.S. procedures aims to end interagency confusion that has led to heartache as families await word on loved ones captured overseas. However, the no-ransom policy is unlikely to change.
Officials say they are unsure of how Kayla Mueller died.
The claim that humanitarian worker Kayla Mueller, 26, was killed could not be immediately verified.
Aerospace firm Fokker Technologies would have paid a $21 million penalty for sales to Iran, Sudan and Burma.
The U.S. and Israeli spy agencies used a bomb in a spare tire during a 2008 operation to kill Imad Mughniyah in Damascus, former officials said.
A criminal complaint says Russian foreign intelligence service wanted Tass to pose questions in New York.