Attack On Titan - Season 1 - Episode 20 - Erwin Smith: The 57th Exterior Scouting Mission, Part 4 [English Dubbed]

Summary :- The Scouts worry over the thought of Titan spies in their midst as Commander Erwin makes attempts to extract the Female Titan's human form. However, the Female Titan uses a scream to attract nearby Titans which devour its body.
Erwin worries that the human pilot has escaped in the steam. When the Scouts are ordered to retreat, a cloaked figure approaches Squad Levi in the air, killing Gunther.