Who killed Jon Snow's father?

Related questions

1. Why did baelish betray Ned?
2. Who holds the Iron Throne at the end of Game of Thrones?
3. Does Theon die?
4. How does Bran die in Game of Thrones?
5. What are the 7 kingdoms of GoT?
6. Is Jon Snow related to the Dragon Queen?
7. How many actors are in Game of Thrones?
8. How did Ned Stark die?
9. What are the 7 families in Game of Thrones?
10. Who really tried to kill Bran Stark?

Tags

1. #aegon
2. #never
3. #targaryen
4. #lyanna
5. #tells
6. #throne
7. #rhaegar
8. #mother
9. #bastard
10. #stark
11. #father
12. #crypts