Everyone knows that Rogue One went through a lot of changes in the reshoots. A lot of the third act changed, and while we got glimpses of the original finale on Scariff a new behind-the-scenes clip from ABC shows the original fates of two characters.
The feature is focused on K-2SO, but the video they included shows the filming of his original death scene. It looks like it was outdoors on Scarif at a bunker door, and when he hits the ground you can see him lying next to the lifeless corpse of Cassian:
You can see the entire video below, the footage of the original death scene is about halfway through the clip: