All evidence points to Neal.
– Not being seen at the showdown nor in the Hook/Henry scene both of which take place in 3×16.
– Kollie saying not only was the death filmed but the “jersey story” took place last week, and in the back you can see them setting up cameras for filming in the graveyard.
– Almost all the characters are wearing formal clothing appropriate for a funeral in the pics(sides Hook whom always wears the same costume).
– The person whom posted the story answered an ask saying a funeral was being filmed when she was on set, but has since deleted the ask.
– The cast present when the person went to set and spent the day with them included everyone but Robert, Michael, and Rebecca. However if Rumple is being controlled by the Witch and the Witch is responsible for the death it makes sense why they would not be there.
All evidence is unfortunately stacking up against Neal even though I don’t want anybody to die.