A Swedish-Palestinian man already serving time in prison for terrorism offenses is being charged by Swedish prosecutors for participating in a barbaric 2015 murder while he was a member of ISIS.

Osama Krayem, ISIS terrorist, was reportedly present as the terror group murdered a Jordanian pilot, Mu’ath al-Kassabeh, who had crashed in Syria.

The ghoulish slaying was filmed and published online, with the video horrifying viewers around the world.

“This bestial murder, in which a prisoner was burned alive in a cage, was staged in a carefully produced video that was broadcast around the world. Its publication marked an unprecedented escalation in the Islamic State group’s violent propaganda,” Henrik Olin, who is prosecuting Krayem, told reporters in Sweden on Tuesday.

“Even though this is a person that’s already sentenced and is serving very long prison sentences in other countries, we will still charge him and we have an international obligation to do so,” Reeva Devgun, who is serving as co-prosecutor in Kayem’s case, said.

Jawdat al-Kasasbeh, the pilot’s brother, told broadcaster Sveriges Radio that his family welcomed Kayem’s prosecution.

“It is painful for my parents to be confronted with this event again, but we are grateful that the Swedish authorities want to give us justice,” al-Kassabeh said.

Krayem, who is also known by his alias Naïm or Naim al Hamed, is currently serving 30 years in prison for his involvement in the 2015 Paris and 2016 Brussels bombings.

The Malmo-born man’s parents, who are of Palestinian descent, immigrated to Sweden from Syria.

In 2005, an 11-year-old Krayem was featured in a documentary about the successful integration of the children of immigrants into mainstream Swedish society.

One of the first Swedish Muslims to leave the country to fight for ISIS, Krayem is believed to have joined the Islamic State in September 2014.

He later returned to Europe on a false passport, and was later arrested in Germany.