The Death of Captain America by Ed Brubaker, etc.
This is a huge book (sequel to this and this), lots of stuff happening with the death of Steve Rogers and the aftermath, including who eventually takes on the roll of Captain America (I'm not going to give any spoilers away). I loved this so much, lots of action, lots of side stories. If you are a Cap fan then you must pick this up. Look, comic books aren't for everyone, but this series (as well as Planet Hulk which was outstanding) are worth a read. Give them a try!