25. Who is responsible for killing Ethan Rom?
From Quiz ...And They Were "LOST" Forever
Answer:
Charlie
After Hurley takes it upon himself to make a list of the survivors from Oceanic Flight 815, he compares his list to the flight manifest and discovers that Ethan never took the flight. Upon this discovery, Ethan retreats into the jungle, taking a pregnant Claire and Charlie with him. While Charlie is saved by Jack and Kate after he's hanged from a tree, Claire disappears for a while before appearing of her own accord (though she's now suffering from a bout of amnesia). As it turns out, Ethan had taken her to a DHARMA Station known as The Staff during this time with the plan to take her unborn child. Luckily, she's saved by Rousseau's daughter, Alex.
Jack and the others plan to trick Ethan using Claire as bait in the episode, "Homecoming", and luckily, they get the upper hand and catch him. Before they can interrogate him as one of 'The Others' though, Charlie shoots him multiple times, killing him for what he did to Claire.
As it turns out, Ethan had been born on the island. Living with Ben Linus and the Others on an adjacent island, he had been sent to the middle-section's crash site to make 'a list'.
In the fifth season episode, "LaFleur", it is discovered that Juliet actually delivered Ethan. Ironically, Ethan was one of the men responsible for persuading Juliet to join The Others before she arrived on the island.