One Tree Hill - Season 4 Apr 2026

: Lucas has a heart attack and is "visited" by Keith while in a coma; Haley is hit by a car.

Season 4 of One Tree Hill (2006–2007) is the final year of high school for the main characters, focusing on the closure of their adolescent lives and the resolution of the series' darkest mysteries. It was the first season to air on The CW network following the merger of The WB and UPN.

: Brooke and Lucas officially break up after she realizes his growing feelings for Peyton. By the middle of the season, Lucas and Peyton finally begin a serious relationship. One Tree Hill - Season 4

: 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.

: The Ravens play for the State Championship; Peyton confesses her feelings to Lucas. : Lucas has a heart attack and is

: 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.

: The prom episode featuring the final confrontation with "Psycho Derek". : Brooke and Lucas officially break up after

: The series' original finale before the four-year time jump; it features graduation and the births of James Lucas Scott and Lily Roe Scott. Thematic Elements One Tree Hill Season 4 Episodes - TV Guide