Part 1 is here. I spoke with Mark Roper of Roper & Sons, and discussed his remarks which had been printed in the Journal Star's "Mortician surprised by New Orleans dead".
He said that FEMA team rules prevent him from discussing figures and details, but I informed him that Orleans Parish District Attorney Eddie Jordan says there were only four confirmed murders in all of that parish in the aftermath of Katrina. When also informed that that parish contains New Orleans, he seemed a bit surprised at the low number. Unfortunately, due to those team rules he did not provide even an estimate of the numbers of homicides, so we may need to wait for various official statements.
UPDATE: For some background, see "Small La. town getting makeshift morgue".