I think my friend is in trouble...?

I have a guy friend who's father just passed away a couple months ago. He has become very reclusive, and he has began to even shut out his friends. He has refused professional or clergy help. I have not heard from him in days of trying to text him (usually we at least text everyday) and his voicemail box is full from other people evidently trying to get a hold of him. Should I go and try to find him to make sure he is ok?