One Tree Hill - Season 4 -

: Deals with the aftermath of the bridge accident involving Nathan, Rachel, and Cooper.

: Brooke moves in with Rachel Gatina, faces a cheating scandal on a calculus exam to ensure she graduates, and begins a relationship with a "Clean Teen" named Chase Adams. Key Episodes One Tree Hill - Season 4

: Haley and Nathan navigate the challenges of being teen parents after discovering they are expecting a son. Nathan becomes entangled with a loan shark named Daunte, leading to a point-shaving scandal that threatens his basketball future at Duke. : Deals with the aftermath of the bridge

: Peyton is targeted by a "Psycho Derek" (Ian Banks), who impersonates her biological half-brother. She eventually meets her actual brother, a Marine also named Derek, who helps her confront her trauma. Nathan becomes entangled with a loan shark named

: The prom episode featuring the final confrontation with "Psycho Derek".

: Lucas discovers that Dan, not Jimmy Edwards, killed his uncle Keith during the school shooting in Season 3. This leads to an explosive confrontation on graduation day.