This guy was killed after criticizing Israel on several fronts. He criticized Israel's war against Iran and in a video said Iran had the right to have the atomic bomb! Then he criticized Israel's attack on Qatar, and hours later he was killed... but the media can invent and create a false flag trying to incriminate Iran and protect the Mossad.
Another option is to blame Turkey to justify Israel's attack on Turkey. There are already fake social media profiles linking the killer to Turkey, the Islamic religion, etc. This was a false flag.