Al Qaeda militants killed American hostage Luke Somers and a South African captive in Yemen during a raid conducted by U.S. forces to rescue Somers, Defense Secretary Chuck Hagel said Saturday.
President Barack Obama ordered Friday's raid because "there were compelling reasons to believe Mr. Somers' life was in imminent danger," he said.
Korkie was to be released on Sunday, the group said in a statement.
He and his wife Yolande had fallen into the hands of abductors in May of last year, but they subsequently let her go. On Friday, a team of local leaders was finalizing arrangements to reunite Pierre Korkie to his wife and children, the statement reads.
Gift of the Givers recently told his wife that "the wait is almost over."
"Three days ago we told her 'Pierre will be home for Christmas,'" the group said. "We certainly did not mean it in the manner it has unfolded."
The President condemned AQAP's killing of the two hostages and explained his decision to authorize the rescue attempt in a statement.
"Earlier this week, a video released by his terrorist captors announced that Luke would be killed within 72 hours," the statement said. "I also authorized the rescue of any other hostages held in the same location as Luke."
In a statement, Secretary of State John Kerry said that a recommendation to authorize the operation had been made to the President.
Obama offered his condolences to Somers' family.
"I also offer my thoughts and prayers to the family of a non-U.S. citizen hostage who was also murdered by these terrorists during the rescue operation," the statement read. "Their despair and sorrow at this time are beyond words."
An Osprey aircraft transported a team of U.S. Navy SEALs to the captives' location. A firefight quickly broke out, and the hostages were loaded onto the plane and flown to a nearby U.S. ship, a U.S. official said.
One of the hostages died before reaching the ship. The other died afterward.
Drones and fighter jets patrolled overhead during the mission.
The U.S. forces who carried out the mission are safe, a U.S. defense official said. Both the President and Kerry praised their valor.
Dear God, rest the souls of Pierre Korkie and Luke Somers. Dear God, comfort the loved ones left behind.