Karlov was assassinated by Mevlüt Mert Altıntaş, an off-duty police officer linked to Gülenist Terror Group (FETÖ) while attending an exhibition at an art gallery in Ankara.
The arrested suspect, identified by his initials H.T., is also a former police officer. He was charged with membership of a terrorist group. Turkish media outlets claimed that the suspect acted as a "brother" for Altıntaş and his roommate Sercan Başar, which is one of many terms used for FETÖ's handlers for the group's infiltrators in the law enforcement.
