Background and career
Mutassim Billah Gaddafi (Arabic: المُعْتَصِمٌ بِٱللهِ ٱلْقَذَّافِيّ, romanized: Muʿtaṣim bi-llāh al-Qaḏḏāfī, also transliterated as Al-Moa'tassem Bellah Al-Qaddafi or Al-Mu'tasim Bi'llah al-Qadhafi; 5 December 1974 – 20 October 2011) was a Libyan military officer, and the National Security Advisor of Libya from 2008 until his assassination in 2011. He was the fourth son of former Libyan leader Muammar Gaddafi, and a member of his father's inner circle. He was said to have been in charge of crushing opposition during the Libyan civil war.
Mutassim was captured by anti-Gaddafi rebel forces during the Battle of Sirte, in the First Libyan Civil War, and killed along with his father.

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