Heath Mansel

Heath Munsell, was originally the leader of the current survey corps. Seeing that he was commander he was probably mildly inteligentt and brave. He wasaa killed in an expedition, and later a titan tossed his decapitated head over the wall, which was unfortunate, as his wife, Elena Munsell saw his head.

Elena later joined a group of titan Worshippers and preceded to open the gates, allowing a titan to get in. The manga latter confirmed that five thousand people or so, weree killed in this break in.