Will this throw them off message? Abu Muhammad al-Adnani, 39, was a founder of ISIS and is credited with the terrorist group’s slick media strategy and signature violent videos. ISIS itself confirmed the death in a statement. Al-Adnani’s death will likely be a body blow to the organization — he was thought to be the second-in-command to leader Abu Bakr al-Baghdadi and oversaw overseas recruitment. But analysts note that he’s just one person, and that the militant group’s history indicates he’ll be replaced quickly.