How come Captain Christopher Pike dies in the latest Star Trek prequel yet is alive in the original series?

Keep in mind that the timeline was altered in the film Star Trek (2009), so the fates of various characters has and could change from that point forward. It has nothing to do with the actor's (Bruce Greenwood) relationship with JJ Abrams. Greenwood has expressed gratitude for playing Christopher Pike, and has acted in Abrams' other films.