Derek

Derek was born into a family of werewolves. His mother, Talia, was much respected within the werewolf community meaning Derek came into contact with members of a number of other packs.

He and his family lived in Hale House in Beacon Hills, California and he attended Beacon Hills High School. Peter Hale claims a 15-year-old Derek conspired with an Alpha (Ennis) to have Derek's girlfriend (Paige) bitten in hopes of turning her into a werewolf. The process didn't take and, to end her suffering, Derek killed her. Having taken an innocent life, his eyes changed from yellow to blue.

Sometime later, Derek entered into a relationship with werewolf hunter Kate Argent. She used him to gather information on his family making him an unwitting accomplice to the arson fire at Hale House that killed most of his family. After his Uncle Peter killed the conspirators involved in the fire, Derek killed him and took the status of Alpha Werewolf. In order to save the life of his sister Cora, long thought dead in the fire, Derek gave up the spark that made him an Alpha. His eyes turned from red back to blue.