Who killed Eren's mom?

Related questions

1. Who is Grisha in Attack on Titan?
2. Is Grisha the beast Titan?
3. How old is Levi in Attack on Titan?
4. Will Levi Ackerman die in Season 3?
5. Is a God more powerful than a Titan?
6. Is Levi Kenny's son?
7. Do Mikasa and Eren ever get together?
8. Do Eren and Mikasa get together?
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Tags

1. #driving
2. #hannes
3. #years
4. #front
5. #killed
6. #mikasa
7. #events
8. #revenge
9. #carla
10. #titan
11. #after
12. #during
13. #maria
14. #kills
15. #against
16. #smiling
17. #mother
18. #invasion
19. #witnessed
20. #titans