Who killed Francis in House of Cards?

Related questions

1. How did Monica die?
2. How did Frank die in house of cards?
3. How did Francis Underwood die on House of Cards?
4. Does Frank Gallagher die?
5. Is Kevin Spacey returning for Season 7?
6. How did Tom Yates die in house of cards?
7. Does Fiona marry Sean?
8. How did Claire get pregnant on house of cards?
9. What happened to Kevin Spacey's character?
10. How did Frances die on House of Cards?

Tags

1. #buried
2. #trailer
3. #father
4. #teaser
5. #season
6. #south
7. #sixth
8. #killing
9. #cards
10. #shown
11. #order
12. #reveals
13. #claire
14. #house
15. #kelly
16. #carolina
17. #right
18. #poisoned
19. #stamper
20. #finale
21. #series
22. #michael
23. #underwood