When Islamic State militants executed American journalist Steven Sotloff last month, the parents of another hostage chose to go public about their missing son.

(SOUNDBITE) (English) ED KASSIG, FATHER OF HOSTAGE ABDUL-RAHMAN KASSIG, SAYING:

"The dynamics have changed now. Steven's family kept the secrecy and he was executed. Peter's name has been listed."

Peter Kassig, who is now known as Abdul-Rahman Kassig, went missing more than a year ago while working as an aid worker in Syria.

He is now facing the same fate as Sotloff.

Kassig was threatened in a video issued by Islamic State that showed British aid worker Alan Henning's beheading.

About two weeks ago, the Kassig family says they received an audio recording from their son, who said U.S. air strikes were jeopardizing his life.

(SOUNDBITE) (English) PAULA KASSIG, MOTHER OF HOSTAGE ABDUL-RAHMAN KASSIG, SAYING:

"It was just automatic, kind of toneless, as though he was a robot, and I'm su