http://en.wikipedia.org/wiki/Khamis_al-Gaddafi
Excerpt:
Reported death
On 20 March 2011, it was reported by the anti-Gaddafi Al Manara Media that Khamis al-Gaddafi had died from his injuries sustained when pilot Muhammad Mokhtar Osman allegedly crashed his plane into Bab al-Azizia a week earlier. The crashing of the plane itself had also not been previously reported or confirmed by any other independent media except Al Manara and the Algerian Shuruk newspaper, which is closely connected to Al Manara, and with it there is a possibility of the reports being part of the propaganda operations by the opposition. Khamis has yet to be seen or heard from since the reported suicide plane crash.^[12][13][14] U.S. Secretary Hillary Clinton stated that she was aware of reports that one of Gaddafi's sons had been killed in non-coalition air strikes, after hearing them from "many different sources", but that the "evidence is not sufficient" for her to confirm this.^[15][16]
The pro-Gaddafi Libyan government has denied that he was killed.^[17]

http://www.yalibnan.com/2011/03/25/death-of-gaddafis-son-khamis-confirmed/