OK, here's a new topic: Who was the most killed character? The question came to me after watching "Similitude", where Tripp bites the dust.
Worf I think is a high contender. First of all he is in Cause and Effect which kills the whole crew several times over. Then he dies during the spinal injury operation, and he dies when falling off the railing in cargo bay, only to be revived by the dude who is evolving to a new species.
And, doesn't he also die during one of the Q episodes, where Wesley also gets killed?