It was a shot of Bobby in the shower after supposedly being dead is my recollection- yep, found it:
https://www.youtube.com/watch?v=PdOpQE5miP4
Referring to the 'Who Shot JR' part was a mixup on my part- was pretty young at the time and not actively watching weekly so I forgot which was which...
However, genuine thanks for the Lost finale spoiler, I never wanted to watch beyond season 2 anyway as it already became rather tedious.
[0] https://youtu.be/BbDgPnXX9dQ?si=XecRP5goplpyEtIP