Köhler, a onetime head of the International Monetary Fund who became a popular German president before resigning abruptly in a flap over comments about the country's military, has died at 81.
Siegel is the first American to be released as part of this deal. A total of 18 hostages have been released since the ceasefire took effect. Hundreds Palestinians have been released so far.
The decision came in response to a petition by attorneys general in 22 states and Washington, D.C., seeking to block the administration's efforts to freeze payments for grants and other programs.
A small plane crashed in Northeast Philadelphia 30 seconds after it took off, Pennsylvania's governor said Friday. The Federal Aviation Administration said two people were aboard.