Jory Cassel is the captain of Lord Eddard Stark's household guards at Winterfell. He is a loyal and trusted servant of House Stark and a good swordsman in his own right. He is the nephew of Ser Rodrik Cassel. He has a noticeable scar, gained at the siege of Pyke during the Greyjoy Rebellion.
Jory Cassel joins Lord Stark and his retinue as they venture out to execute Will. He is with the group when they find the direwolf pups.
Jory accompanies Eddard south to King's Landing. During the dispute between Prince Joffrey Baratheon and Arya Stark, Jory reports that Arya has been found and taken before the king. Jory accompanies Eddard to the Crossroads Inn and listens as King Robert questions those involved. Queen Cersei convinces him to sentence Sansa's direwolf Lady to death despite her not being involved because Arya's wolf Nymeria cannot be found. Eddard asks Jory to look after Arya and Sansa while he attends to the execution
Jory assists Eddard's investigation into Jon Arryn's final days, unsuccessfully asking for the assistance of Ser Hugh of the Vale , accompanying Eddard to Tobho Mott's smithy and later reminiscing over fighting in the Greyjoy Rebellion with Ser Jaime Lannister.
Jory accompanies Eddard to Petyr Baelish's brothel, still seeking illegitimate royal children. Jory is distracted by one of the whores while Eddard questions Mhaegen. On leaving, Lord Eddard has to break Jory's attention away from the woman he is staring at so they can leave. Outside they and two Stark guards are confronted by Jaime Lannister. Jaime has heard of his brother Tyrion's arrest and demands his release. Lord Eddard says it was done by his orders and if Jaime kills him Tyrion will die. Jaime has brought several Lannister men-at-arms. Jory begins to let Jaime know that if he is to threaten Eddard again, there would certainly be a fight. However, Jamie interrupts Jory, and he orders his men-at-arms to leave Eddard Stark alive, but to kill his men. They kill Jory's men with thrown spears. Jory attacks and kills two of Jaime's men before engaging Jaime himself. Jaime and Jory trap swords and Jaime stabs Jory through the left eye with a dirk during this event. Eddard, angered and stunned by Jory's death, exchanges several blows with Jaime before a Lannister guardsman stabs him through the knee, ending the melee.
When news about Jory and the others reaches Winterfell, Theon Greyjoy insists that Robb must make the Lannisters pay for their deaths, but Robb is hesitant about going to war.
Captain of the Guard at Winterfell, Jon traveled with Ned Stark to King's Landing and continued to serve him there. He was present when Jaime Lannister and his guards seized Ned in retaliation to Catelyn Stark's capture of Tyrion Lannister. In the ensuing fight, Jaime Lannister killed Jory.