U.S. Ambassador Chris Stevens died of smoke inhalation after the U.S. Consulate in Benghazi, Libya came under attack last week. But why was he unable to escape the danger? We look at this question as part of our ongoing series on national security.

FOX News Radio's Courtney Kealy, who reported extensively from Libya during the uprising has Part two of our series, "Death of an Ambassador":

Securing America.

No group has claimed responsibility, but National Security Analyst Kerry Patton says Al-Qaeda in the Arabian Peninsula is serving as a cheerleader with this statement:

Patton: "Whoever from among our Muslim brothers captures U.S. Ambassadors or Envoys, he may follow in the footsteps of the grandsons of Umar al-Mukhtar in Libya who set the best example by killing the U.S. Ambassador."

Patton says because diplomatic security teams always plan several avenues of escape, an infiltrator could have told attackers about Stevens' security plan.

Patton: "We might be able to point a finger at the actual plan that was in place, not allowing the secondary evacuation, because he was trapped."

Courtney Kealy, FOX News Radio.

Click HERE for part one of the series "Death of an Ambassador"

Click HERE to read Courtney Kealy's American Dispatch on Ambassador Stevens' death

Follow Courtney on Twitter: @CourtneyKealy