The Justice Department has filed charges against Ahmed Kattalah, a Libyan militia leader long thought to be a key player in orchestrating the attack on the U.S. diplomatic compound in Benghazi, Libya, according to a news report on CNN.

Kattalah is the founder of the Islamist militia Ansar al-Sharia, an al Qaeda-affiliated terrorist group that absconded with Ambassador Chris Stevens the night of the attack. It is not known if Stevens had already died before the militia group took him to a hospital it runs after setting fire to the compound and killing three other U.S. citizens that night.