you are 100% correct
Most of the hero characters in Dead Space "lore" are killed off at the end of the their story arc. Only exception is probably the ones who left the mining vessel just before Isaac's team arrived. Their fate, I believe, is unknown.
To the OP, thanks for the slight spoiler in the thread title.
Like I mentioned, it's my point of view and I don't know what really happened [(but who knows)].
[Edited by WiedzminDylan, 10/4/2010 10:43:00 PM]