I'm not so sure I agree with going over unannounced instead of calling. His family is in a very, very hard place right now and they don't need to have people dropping in - they need their private time. At least a phone call wont impose on that.

While its hard to know what to say to make someone feel better in this situation, you really don't have to. All your friend needs is to know you are there for him and that you care....that is ALL you have to say.

I will keep him and his family in my prayers. How sad....well, devistating.