I've been on that position last summer. He was one the person that was always chill, smiling and saying, "everything can be fixed" you know?
My sis woke me up one day telling me he had jumped off a bridge. No one knows why, not even his parents.
You can only do one thing man, try to visit him anytime you can and just remember the good times, in a bit you'll be there with him. At least is what i wish for me...