Rooting my Galaxy s4 I just can't.  I just switched from an iPhone to a galaxy s4 and i don't even know whwhere to start. It's version 4.4.4 model sgh m919 and it's so complicated I dont even know where to begin.
I ran into this problem with the SGH-M919 NK2 (4.4.4) build as well.  Unfortunately, none of the one-click Root programs work as of right now, such as Kingo or iRoot.  BUT!!  Good news is that the NH7 Odin root package works to root the device.  So, to  go to this link, and download the root file.  

http://download.chainfire.eu/328/CF-Root/CF-Auto-Root/CF-Auto-Root-jfltetmo-jfltetmo-sghm919.zip

Next, download Odin3, and follow these simple instructions from XDA:

http://www.jayceooi.com/how-to-install-galaxy-s4-firmware-i9500-i9505-with-odin/

Now, manually download SuperSU, or SuperUser from the Play store.
Voila!  You are now rooted on the NK2 build!

REMEMBER...you will be using the CF-Auto-Root[.tar.md5] in the PA box.