That would be Dr. Shephard, who's now getting $225,000 per episode. Looks like Evangeline's in negotiations too.
Of course, this doesn't necessarily mean they won't be killed, especially since it would now be financially beneficial to the show to kill them off. ;)
Incidentally, I finally pre-ordered my Lost Season 4 DVD, which isn't due out until December 9th. I know they want hype to build for the Christmas season and all, but given the show's really, really long hiatus wouldn't one think it would be better to release it around the beginning of the new TV season to dredge the show out of the bottom of everyone's mind? Or am I just being really, really impatient?