Creatively image a question and justification for this answer: no
The question is: Was Gandalf present at the death of Eomer?
Step-by-step reasoning process: Eomer died in a skirmish with orcs outside Rohan at the beginning of Two Towers. Gandalf had been killed by the Balrog at the end of Fellowship of the Ring. Gandalf returns with improved powers later on in Two Towers.