HBO's On Demand is now offering a 3 minute recap of many of the big "hits" from all the prior seasons. (They've included some that have died "naturally" like Livia and Bobby Bacala's dad).
Surprisingly they've included the Russian from the pine barrens, so, at least according to HBO, he's officially dead. (Not surprisingly Adrianna was included).
when showing the russian in the pine barrins they put a question ? mark next to his name so im not convinced hes dead, very likely he'll be back