Religion
In The O.C.
The use of the song Hallelujah is first used in the final scene of the first season.
The second time the song Hallelujah is used is in season three when Marissa dies.
Julie and Caleb walk down the aisle, as Ryan and Teresa face a difficult decision regarding their pregnancy, forcing Ryan to head back to Chino. Marissa moves into Julie and Caleb's new castle on the cliff, and Seth struggles to find himself when the things around him seem to fall apart. Which leads to his decision to take the "Summer Breeze" and sail off into the sunset. Life in The O.C. comes full circle from one year before.
"Marissa catches Volchok cheating on her at prom ending the relationship. Ryan shows up to Volchok's place and a fight breaks out between the two rivals. Volchok had the upperhand in the fight and was going to finish Ryan off. As Volchok proceeded to smash Ryan's face, he quickly blocks it and reverses things. Ryan repeatedly bashes Volchok in the face with his fist, beating him nearly to death before Ryan stops. He takes him to a nearby hospital where Volchok says he was jumped and didn't know who did it. Volchok assures Ryan that "this isn't over". He decides to blackmail Ryan initially to participate in a robbery, along with car theft, to hep him escape Newport, and finally to get Marissa to talk to him again when he realizes that she was the best thing to ever happen to him."(Wikipedia)
"Marissa refuses to become reinvolved with him .... Causing Volchok to snap, and the incidents in the video above to occur. Leaving Marissa to die in Ryan's arms." (Wikipedia)