Isaac Lahey

Isaac Declan Lahey (b. February 1995) is the son of Edwin Lahey and his wife, Amber. He is the younger brother of Camden Lahey. He is the brother-in-law of Olivia Johnson. He is the uncle of Jade Lahey.

He was approached by Derek Hale, who had recently become an Alpha and was looking to build a pack. Isaac then consented to the Bite and successfully turned into a Beta Werewolf. He continued to be a member of the Hale Pack, during which time they joined forces with Scott McCall and his friends against threats such as the Argent Hunters, the Kanima and its master, the Alpha Pack, and the Darach, all of which caused death and destruction to their town.

After his father's death, he was suspected of his death but he was later cleared as Aurora had become the main suspect after she threatened Edwin over Isaac. Isaac confront Aurora about why she threatened his dad and she revealed that she was his was Camden's best friend growing up, she had the same argument with Edwin in 2004 about Camden. Camden walked into living room where the two were talking. Isaac tearfully hugged his older brother.

However, some time after the deaths of his close friends and packmates Erica Reyes and Vernon Boyd, Isaac began drifting away from Derek and toward Scott, who had recently learned he had the potential to be a True Alpha. Isaac continued to live with his brother at the Pierce House after Derek kicked him out of his loft in an effort to protect him from the Alpha Pack.

After Derek gave up his Alpha powers to save his sister Cora, Isaac, now without an Alpha, officially joined the McCall Pack as Scott's Beta and worked with his new pack to fight against the Nogitsune, who had recently possessed his friend and packmate Stiles Stilinski, and as well as the Oni, who were hunting the Void Kitsune as well. However, following the death of his girlfriend, Allison Argent, the devastated Isaac left Beacon Hills with Allison's father and Isaac's mentor, Chris Argent, and moved to France with him, where he continues to live now even despite Chris returning to their hometown to assist the pack in their fight against supernatural and human threats.

Isaac is a member of the Lahey Family, and a former member of the McCall Pack and the Hale Pack.