In Mortal Kombat 9 (2011 version) for the PS3 and Xbox 360, each character has multiple fatalities that they can perform at the end of the match.
This is the list of fatalities, and the babality and stage fatality for Nightwolf.
All of these moves can be unlocked and added to your moves list by performing them in either Arcade Mode or Versus Mode.
Looking for more finishing moves? Check out my complete fatality guides:
Fatalities and babalities for Mortal Kombat on Xbox 360
Fatalities and babalities for Mortal Kombat on PS3
Nightwolf’s Fatalities & Finishing Moves
Xbox 360
Ascension — Down, Down, Forward, Back, X within sweeping distance
Little Off The Top — Down, Forward, Down, Back, B in jumping distance
Babality — Forward, Back, Forward, Back, X in jumping distance
Stage Fatality — Down, Down, Down, RT at close range
PS3
Ascension — Down, Down, Forward, Back, Square within sweeping distance
Little Off The Top — Down, Forward, Down, Back, Circle in jumping distance
Babality — Forward, Back, Forward, Back, Square in jumping distance
Stage Fatality — Down, Down, Down, R2 at close range
