Board Thread:General Discussion/@comment-1031724-20170706014932/@comment-1031724-20170709175859

And Vol 2 where Nebula tells Gamora she'll kill Thanos

I'm pretty sure whoever kills him will use the Infinity Gauntlet (because how else do you kill Thanos without setting up a 1 on 1 fight with Dormammu?), the question is who. It could very well be Nebula, depending on who can wield Infinity Gauntlets. If it's as deadly to the user as Infinity Stones, she might pull off a Heroic Sacrifice.