SAN DIEGO - The mother of a U.S. State Department communications specialist killed in an attack in Benghazi, Libya, is not satisfied with the resignations of top State Department employees.

"My son is dead and I want to know why … There's a bunch of people running around saying, 'Not me, not me,'" said Pat Smith, whose son, Sean, was killed in the September 11, 2012, attack.

U.S. Ambassador Chris Stevens and two Navy SEALs -- Glen Doherty and Tyrone Woods -- also died in the attack.

An investigation revealed that the U.S. State Department "ignored calls for more security," and that "security was not a top priority for Washington."

"I just want to know the truth," Smith said from her Clairemont home. "My son was good at what he did; they just did not take care of him and I want to know why."

The families of Doherty and Woods -- who both have ties to the San Diego area -- want answers as well.

The attack on the diplomatic mission was first reported as a spontaneous reaction to an Internet video, which was later proven to be false.