Isaac Lahey

Isaac Lahey was a supporting character in season 2 and 3 of Teen Wolf. He's a student at Beacon Hills High School who was also on the lacrosse team. After Allison's death and the defeat of the Nogitsune, Isaac left Beacon Hills with Chris Argent and did not return. He is played by Daniel Sharman.

History

In season two, he works in the cemetery and is bitten by Derek Hale. We also learn that he was abused by his father and eventually ran away from his house. Isaac is later suspected of killing his father and also joins Derek's pack with Erica and Boyd. In the end of the season, he helps defeating Gerard Argent and the Kanima.

In season three, he befriends with Scott McCall and becomes Allison's boyfriend. With his friends, he investigate on human sacrifices by the Darach and helps fighting Oni. When Allison dies, Isaac moved in Paris, to France and is never seen again.