What can i do??

Ok so... This guy that my fiancé has looked up to was kind of like a grandpa but more of a dad than his own dad was to him. We just found out that he has passed away and my fiancé is torn apart. I hate seeing him like this and i was just wonder if any of you had any advice of how i can help him cope with the situation? I don’t know what i can do to help him. I know that i can’t do much because it can’t be fixed but still I want to be able to comfort him more. So any advice ladies??