Most people withdraw when greaving. They dont want to be around people or socialize in public.
I find that just "being there" and "LISTENING" can be the most helpful. My only comment is to offer my condoelences, explain that I have been in the same place and tell them, "If you want to talk Im here for you!" I only offer suggestions when asked to do so.
Because they tend to withdraw, I also ask if its ok to contact them every few days. I dont like to let depression take over so I'll offer to have them over for dinner. Then Neka and Patchs can work thier magic.