My best friends uncle died. What should I say to him?

Germany
April 11, 2011 3:25pm CST
I just heart that my friends uncle died today and I don't know what to say to him. He and his uncle liked each other very much so you can imagine that it's very hard for him but I really don't know how to encourage him. I know that he needs some time to mourn but how long is ok? Should I try to encourage him now or in 4 weeks? And which words could help him? I really don't know what to do... I know that time can heal and wound but my friend is someone who accuses oneself. Thanks for any tips or opinions!