In Winterfell Ned Stark son had been pushed of a tower but is currently unconscious. some one had been sent to finish the job.
Ned meets his demises
The Starks are in a an ongoing feud with the Lannisters because they think that the Lannister are the reason why their son Bran was pushed of the tower.
Starks are in morn
Ned proceeds to go to help his friend the king. Later the king gets killed while hunting. so the king says that his fightful son will get the throne but his son isnt really his son. Ned says that he shouldnt get the crown and thats treason.
Ned had been charged with treason. The young king beheaded Ned because he wanted to.