a friend of mine (29yr old) lost his brother in an accident. he's started stuttering.

a friend of mine (29yr old) lost his brother in an accident. he's started stuttering. My question for you guys is... is he probably aware of this? should I mention it? is there anything I can do? I live in a different continent to him now, but he's still a very good friend of mine. We play chess online and whenever I go back to my hometown I see him and another friend, as we three are close friends together. So, as I rarely see him, the difference to me was really obvious. Also, I guess my last question is, is this normal? Can he expect to get better through counselling? Thanks from an utter stutter newb.