I don't feel as if there is much to be said during times like that, I tend to think it's more so about what I can do. Sure I can tell them I'm there for them or try and say it'll be alright, but it's hard to reach someone with a few simple words when they're heavily grieving. I think body language, acts of compassion and empathizing with them go much further than just saying something... but words can be an okay filler.