That's very close...it's ~13 per day:
From a November 2006 article:
4,380 Americans murdered annually by illegal aliens. [That's 365 murdered Americans every single month, or 27,740] since Sept. 11, 2001
From a September 2006 article:
...between 1,806 and 2,510 people in the U.S. are murdered annually by illegal aliens. If [Mac Johnson's] right, that would represent between 11 percent and 15 percent of all murders in the U.S.
Thanks, those figures don’t seem to hold much sway with a lot of folks. a sad fact.