Initially, officials said the man 34 years was killed in a shootout in Sirte. However, a circulated photographs showing different things. He was captured alive, but the events that led to his death remains unclear.
Mutassim is his father's national security adviser, although he had masterminded a failed coup against
Gaddafi in his youth.
He enjoyed a luxury lifestyle in Tripoli, and a former girlfriend, Talitha van Zon, said he spent 1.3 million pound sterling to finance his lifestyle every month.
Dutch glamor model, said he flew to St. Barts in the Caribbean island every Christmas with her friends to relax with Mutassim. He also invited singers like Beyonce and Mariah Carey to sing at her parties, where guests including Jon Bon Jovi, Lindsay Lohan, and rapper Jay-Z is present.
Van Zon fled from Libya to Malta with a humanitarian ship in August after he claimed the rebels had threatened to burn him alive.