Dave

On the third night after the Doors stopped closing, Grievers entered the Glade and took Dave from the farm. Thomas thought the other Gladers he was hiding with were feeling guilty yet relieved that they were not the one taken and that they might be safe for one more night. Thomas deliberately went after the Grievers who took Dave so he could attempt to save Dave and be stung, thus recovering parts of his memory through the Changing that would help the Gladers get out of the Maze. Dave is not mentioned later on in the book, so it can be assumed that Thomas was unable to save him and he was killed.