"I think everybody is devastated by the loss, including the Feeneys. And they're cooperating fully with the investigation," company spokeswoman Sarah Smith said. "They've not been charged with anything. And we suspect that they won't be charged with anything."
She said the CTU contractors knew Kitterman as "simply comrades living in the Green Zone."
"They ate meals together and just knew each other, I guess, being around one another. I think there was a mutual respect for one another and I know for a fact that the Feeneys are really devastated by his loss. The day he was murdered, I got a call saying how upset everyone was," she said.
CTU trains corporate officials on how to avoid terrorists while they are overseas. The company, which has operated in Iraq since 2003, also has gained attention for rescuing American children taken to foreign countries in custody disputes.
A U.S. Embassy spokesman confirmed that five Americans were being held by the Iraqi government and had been visited by consular officials. They looked well-treated, he said. The spokesman declined to say why the men were being held.
In November, the Iraqi and U.S. governments signed an agreement under which Iraq regained control of its own security. According to the pact, U.S. forces are scheduled to withdraw from Iraqi cities by the end of this month and from the country by the end of 2011. The agreement did away with the immunity from prosecution in Iraqi courts that Western contractors had enjoyed since the U.S.-led invasion of Iraq in 2003.
The Associated Press contributed to this article.