After Marissa breaks up with Volchok, he follows her in his car to make her pull over so that they can talk. Ryan, who is driving Marissa to the airport, refuses to pull over. Volchok slams into their car and Marissa dies moments later.
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Mischa Barton wanted to persue her career somewhere else and some people rumour she didn't have a very good relationship and status with the crew.
The car she is riding in with Ryan Atwood is run off the road. It flips over and crashes. Ryan pulls her from the wreckage and she dies in his arms.
Mischa Barton
Marissa* Cooper dies in a car accident with her boyfriend Ryan Atwood. The car was swurvered into by Volcheck.
yup, she dies in season 3!
Marissa Cooper dies at the end of season 3 and she is the main character too, but also Seth's grandpa - Caleb Nichol - dies of a heart attack.
As far as I can tell, Marissa meets Alex in "The Ex-Factor" (Season 2, Episode 9 ([Episode 36 overall]). Ryan leaves drunken Lindsay on the beach by herself and she eventually seeks after him. Lindsay ends up running in to Marissa instead, who brings Lindsay back to Alex's office. When Ryan yells at Marissa for being the catalyst in Lindsay's getting drunk, Alex defends Marissa. The two then drop Lindsay off at home and Marissa ends up at Alex's place. However, an introduction never seems to occur between them, so there is a good chance that the audience is supposed to assume that Marissa and Alex already knew of each other's existence because Alex was dating Seth prior and Marissa is essentially in the same circle as Seth.