Just joining ENWorld, I've got two player deaths to report.
Our poor level one wisdom based monk, Zenus, had so much going for him. Being a fourth edition PC, he was fairly durable, but managed to completely fall flat on his face in his first battle. Charging the kobold horde alone, he "Open the gates of battle"ed, critically missed, and then proceeded to eat two criticals and one max damage roll from the kobolds going immediately after him in initiative. In another spectacular showing of failure, he then failed his death saving throws all in a row. RIP Zenus. As a friend of mine put it, "Being level one... doesn't always mean you get to make it to level two".
The next one was uneventful. In my 4th edition translation of Tomb of Horrors, one of the PCs fell upon a poison spike in the first room and was killed. Not much else to say, unless you count the retrieval and using of her body as a meat sack to test out the room with the magic bolts. Eventually the PCs abandoned the tomb. RIP cleric whose name I don't remember.