France 24 are reporting Libyan officials as claiming the US Ambassador to Libya was killed:
The US ambassador to Libya has been killed in a rocket attack in the eastern city of Benghazi along with three other embassy staff, Libyan officials reported on Wednesday
More from France 24
The protests in both countries were sparked by outrage over the film “****” which ridicules the Prophet Muhammad. The movie was made by American Israeli Sam Becile, a 52-year-old real-estate developer from California who told the Wall Street Journal that “Islam is a cancer”.
Excerpts from the film, which has been dubbed into Arabic, were posted on YouTube. It depicts Mohammad as a philanderer who approved of child sex abuse and contains other insulting claims.
Terry Jones, the controversial Christian pastor who triggered riots in Afghanistan in 2010 by threatening to burn the Koran, has been involved in promoting the film.
Associated Press reported that Becile had gone into hiding in the wake of the attacks and blamed lax security for the death of the state department official at the consulate.
(Redaction of film's name and bolding mine)
3:09 AM PT: As I note in a comment below, most sources are quoting or paraphrasing a single Reuters source as being told this by Libyan officials. The reports are so far unverified by a second primary source, hence the retention of the quotes in the title.
3:13 AM PT: Al Jazeera gives the cause of death of the ambassador and two guards as smoke inhilation following a fire set by the protestors
http://www.aljazeera.com/...
4:14 AM PT: In view of the confirmation of the ambassador's death, I have removed the quotes in the title. However the cause of death still seems uncertain as there are differing reports of either suffocation or a rocket attack. (The incident is confused so there could be elements of both stories in the actual events)