Derek Sommers

Derek Sommers is a US Marine and the half-brother of Peyton Sawyer. He helped her overcome her feelings regarding her attack by Ian Banks, who posed as him in order to gain her trust. He eventually forced Peyton to deal with her problems and the two formed a close relationship despite his sudden departure when his duties as a marine called him away from Tree Hill

Before the Series

 * Derek past – His mom is african american, left for military when a little older than Peyton was. He joined the miltary, and it saved his life. His dad left him when he was little. Mom juggled two jobs, and Derek started getting into trouble. He found out he was scared.
 * DEREK – PAST – Boxed really young, taught by dad. He knew all about Peyton and hated his dad, Ellie and her for it.

Season 4
A while after Ellie Harp passed away, Peyton takes out a Led Zepplin album that Ellie left her. She finds a note saying she has a half-brother named Derek with his phone number. Peyton decides to reach out to him, after calling him, he hangs up the phone on Peyton telling her never to call him again. After being rejected by him, Peyton uses her podcast to reach out to Derek saying she wants to meet him. A man named Ian Banks listening to her broadcast is obsessed with Peyton so he pretends to be her half-brother after stalking Peyton's webcam for quite a while. Ian shows up at Peyton's doorsteps saying he is her brother and tells her his name is Derek when his real name is Ian. She believes him and they start hanging out. Shortly after, Ian is jealous of Peyton's relationship with Lucas Scott because Ian knows her feelings for Lucas and tries to break them apart by saying Lucas told Brooke he would never talk to Peyton and also pretending to be Lucas by creating a fake instant messenger account and started to chat with Peyton. Peyton finds out it was Ian who was pretending to be Lucas and she gets scared. She stays at Lucas' house and Lucas calls the police and soon, the police call Lucas saying they have Derek. He shows up at the station and sees Peyton's real brother and says that he is not the one they are looking for. Lucas realizes that Peyton is in danger because Ian is still on the loose. He runs to Peyton whilst Ian is in the middle of attacking Peyton. The real Derek then spends his time trying to make Peyton stronger because she fears Ian. Peyton feels uneasy.Derek then starts teaching Peyton how not to be afraid.He brings a practise mannequin in Peyton's house to teach her boxing.He then tells her to take a chance with Lucas as he cares about her.

Season 6
Derek shows up at the USO concert but leaves shortly after.