For me, it's 0 in our long running campaign, and 2 in the everquest game we're running, which has had 3 sessions.
The caveats: In the long running game, we've had 3 players switch out 4 total characters because they were either no longer interested in journeying with the party, or no longer welcome.
In the EQ game, we've had 2 deaths out of 3 games. Both happened the same game. Course the first death was my PC, when I attempted to kill the diseased Shadow Knight (who happened to be another PC), and then the rest of the party killing the Shadow Knight after he rolled 2 crits.
So I don't know if those count either.
In the last campaign we played, we had 2 Cohort deaths, 2 pc's turned to stone, but then brought back, and one pc that fled into the wilderness to avoid being killed by an evil demi-god (odd campaign). We did have any number of pc's go down to negative realms and survive only by using "fate points" (similar to hero points) to drop to -1.
Although now that I remember that campaign, we did have one player, who later dropped out, that had 3 characters die, most of them in horrible amusing ways. The player was a friend of a friend type, and didn't really have much sense. His first PC died at the hands of orcs, after the party rode out on a scouting mission. All but one pc rode faster, lighter horses. He chose a warhorse in full barding. We quickly proved the "I don't have to outrun the X, just you" axiom, to everyone's (but his) amusement.
The other PC's died about as well, and he finally gave up on playing, much to our relief.
He also started such gems as walking in to the tavern (while playing a paladin, no less) and saying "I'm looking for the thieves' guild." The amusing response: "Sorry, bar's closed." "But there are people here!" "Bar's closed."
Later, he managed to cripple a man who was down on his luck, drinking to much and abusing his son in an attempt to rally his spirits, and then flee the scene.
Good times.
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