Quranism also took on a political dimension in the 20th century when Muammar al-Gaddafi declared the Quran to be the constitution of Libya.[72] Gaddafi asserted the transcendence of the Quran as the sole guide to Islamic governance and the unimpeded ability of every Muslim to read and interpret it. He had begun to attack the religious establishment and several fundamental aspects of Sunni Islam. He denigrated the roles of the ulama, imams, and Islamic jurists and questioned the authenticity of the hadith, and thereby the sunna, as a basis for Islamic law.
https://en.wikipedia.org/wiki/QuranismWhy did they have to kill him?