(PIX11) - Video released online Tuesday appears to show ISIS captors setting Jordanian pilot Lt. Muath al-Kaseasbeh on fire as he stands in a locked cage.
The disturbing footage was posted on ISIS' official al Furqan media site, but has not been independently verified.
According to reports from Jordan's state TV, the 26-year-old pilot was killed a month ago, on January 3rd.
"Should, in fact, this video be authentic, it's just one more indication of the viciousness and barbarity of this organization," U.S. President Barack Obama said in response to the video. "And it I think will redouble the vigilance and determination on the part of our global coalition to make sure they are degraded and ultimately defeated."
Relatives and friends were holding out hope after his fate was not mentioned during a recent video featuring Japanese journalist Kenji Goto, the latest prisoner purportedly decapitated on video.
ISIS had demanded Japan pay them $200 million in ransom.
Militants captured Al-Kaseasbeh after his F-16 crashed in Syria, near Raqqa, in December.
Jordan had been working with ISIS to secure the release of al Kaseasbeh, and recently demanded proof of life before trading al-Qaida prisoner Sajida al-Rishawi.
Al-Rishawi was apprehended during a suicide bomb attack in 2005 at a Jordanian hotel after her explosive device failed to detonate.
This is a developing story; refresh for updates.