The files are for the legion which has also partielly worker animations. At least this unit had no DieFade animations, so i guessed it also yours (and i really hope that there are not more than one legionary without DieFade Animations released).
But even if this should be wrong, the second part is the generell descriptions how to add fade to a unit (without fading you could also use an "empty"* DieFade animation - the unit will stay in the last position of the die animation, because there is no new information which could "override" the old one)
* means only: NiControllerSequence, NiStringPalette and NiTextKeyExtraData
more or less:
first try the files i linked above - if they work you "only" have to add the fade informations to the kf, if not
look at the kfm if there are entries for the DieFade animations, if not add this entries
use one of the kfs (eg the die kf) and remove and delete every controlled block (afterwards there should only be the 3 nodes i wrote above in the kf)
set the stop time to 0.9667 in the NiControllerSequence and the text keys [there should be only two text keys, one at 0 with the following text: "start eventcode=1025" [2025 for DieBFade] and the second at 0.9667 with "end" as text (i think not every entry here is really that important, but it´s better to be close in sheme to a vanilla kf file)]
test this files
if they work, add fade if you like