"There's a pretty powerful emotional scene at the end which is Tsu'tey's death ... which happens off-camera in the original release. [In the original film] he kind of falls off the back of the shuttle and that's the last that you see of him but here we follow through. We have this emotional scene with Jake [Sully] and Neytiri and some other Na'vi that gather around him in the forest," Cameron said. The director added that the decision to cut down on Tsu'tey's passing was initially met with resistance from his team.
"It's a funny thing because everybody that was working on the film, when I said I'm taking out Tsu'tey's death, they said, 'What? You can't do that!' They had all fallen in love with it [because] it's a pretty powerful moment," he said. "It's such an amazing accomplishment on [visual effects supervisor Timothy] Webber's part because the emotionality in the CG is really quite stunning."
Slashfilm rounds up more relevant details.