The US Department of State website includes a search feature for Death of U.S. Citizens Abroad by Non-Natural Causes. It appears that the murder of Ryan Manelick on December 14, 2003 is in the database. The presumed death of Kirk von Ackermann on the day of his disappearance, October 9, 2003, is not.
Death of U.S. Citizens Abroad by Non-Natural Causes
US Department of State
Data is available from October 2002 to June 2010
A screen cap for December 14, 2003 is shown below.
The search results show the name of the area as 'Addujayal, Iraq' which in all likelihood is the town of al Dujail - just to the south west of what was then Camp Anaconda (now known as Joint Base Balad). The map below shows the region.
View al Dujail, Iraq in a larger map
I am making my way through the events recorded in the database trying to pair up deaths with known kidnappings.