After watching Avengers: Age Of Ultron, I was wondering whether the motives behind the death towards the end of the movie had anything to do with the fact that Fox owns the rights for X-Men, and already have their own version of the character, portrayed by a different actor?
It seemed a bit odd to me because he is a prominent character in the Marvel universe as can be read in the Wikipedia article for Quicksilver and the Marvel Wiki article for Quicksilver. Additionally, in my opinion, his death did not really bring a significant impact to the movie per se.
I understand that this might not be the case but I can't help to wonder, did Disney have some agreement with Fox that the Quicksilver character would only be brought in for one movie only?