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.

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

: The Ravens play for the State Championship; Peyton confesses her feelings to Lucas. One Tree Hill - Season 4

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

: 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 : Lucas discovers that Dan, not Jimmy Edwards,

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.

: 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 Ravens play for the State Championship;

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