Captain America has died in many different stories and movies, so it is probable to say that there is a good chance that Captain America will die or attempt to die in Avengers 4. However, there is only one way to tell and that is to go see the movie. Since this movie is a sci-fi and fantasy-type movie, things don’t have to be realistic.
In a realistic movie or drama that will most likely have a sequel, the storyline really can’t kill off a character especially the main character. They would really have to think about this. Usually, the only reason this happens is because the actor or actress doesn’t want to come back to this movie. Otherwise, the character can be killed off.