How did Cathy die on House of Cards?

Related questions

1. What happened to Frank on house of cards?
2. What happened to Francis on house of cards?
3. Who killed Cathy house of cards?
4. Is house of cards coming back?
5. Is Claire really pregnant on house of cards?
6. Will there be a house of cards spinoff?
7. Will Kevin Spacey return to house of cards?
8. Is house of cards done?
9. Does Janine die in house of cards?
10. What happens to Kevin Spacey's character in House of Cards?

Tags

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2. #keeping
3. #miraculously
4. #season
5. #underwood
6. #claire
7. #secretary
8. #assassin
9. #acting
10. #survived
11. #pushed
12. #cathy
13. #durant
14. #flight
15. #frank
16. #jayne
17. #stairs
18. #state
19. #atkinson
20. #underwoods
21. #french
22. #under