As a GM, I've killed many PCs with elves simply because they dared to trespass into an elven domain. In such instances, the players in question are always stunned that they were ambushed and captured (after one or two PCs die) by these Neutral Good-Chaotic Good elves, and then we'd get into some sort of argument about the nature of alignment.
Player 1: "They'd present themselves to us and threaten us!"
Me: "Why? And give away the element of surprise? These elves are fewer in number compared to humans and dwarves, and you've made no effort to contact any of them. If there were an elf in your party they might've held their fire and done something that you ask."
Player 2: "But they're Good, and we're Good aligned."
Me: "Does that mean you're friends? No. They don't know you, or your intentions. For all they know you could be advance scouts for a pre-emptive invasion of their forest."
So, yes, I've had elves kill PCs. I've had a PC killed by an evil Wood Elf Ranger who was handy with a Sunbow.