<P> In season 3 , Peyton learns that she was adopted , and that Ellie really is her biological mother . Lucas witnesses Ellie purchasing drugs , but he learns that she was buying them for medical reasons ; she has breast cancer . Meanwhile , Peyton is angry with Haley because she left Tree Hill to go on tour , but soon they make amends , and Peyton reveals that her hostility toward Haley was because she was the only one that came back out of all the people who have left her . Peyton soon grows close to Ellie , and they collaborate on a CD called Friends with Benefit , which benefits breast cancer research ; there will also be a concert for it at TRIC and Haley is one of the performers . Unfortunately , Ellie dies before she sees the CD or the concert , leaving Peyton devastated . A school shooting breaks out later in the season ( `` With Tired Eyes , Tired Minds , Tired Souls , We Slept '' ) , where Peyton is left fighting for her life after being the one shot. Lucas and Nathan run inside the building to save Peyton and Haley ; Lucas finds Peyton bleeding out of her leg inside the school 's library . She can not walk due to the injury , so escaping is out of the question . Lucas and Peyton stay in hiding , and Lucas wraps her leg , hoping to help the bleeding and pain subside . As Peyton is falling in and out of consciousness , he forces her to talk about a fun day she once had . Minutes later , after earning a promise from Lucas about everything being okay , Peyton loses hope of surviving , despite Lucas promising to get her out of there alive ; she kisses him , wanting to let him know that she loves him before she dies . Lucas returns the kiss , and Peyton soon falls unconscious . Lucas , not wanting her to die , carries her out of the building , even at the risk of being killed by the shooter . </P>
<P> In season 3 , Peyton learns that she was adopted , and that Ellie really is her biological mother . Lucas witnesses Ellie purchasing drugs , but he learns that she was buying them for medical reasons ; she has breast cancer . Meanwhile , Peyton is angry with Haley because she left Tree Hill to go on tour , but soon they make amends , and Peyton reveals that her hostility toward Haley was because she was the only one that came back out of all the people who have left her . Peyton soon grows close to Ellie , and they collaborate on a CD called Friends with Benefit , which benefits breast cancer research ; there will also be a concert for it at TRIC and Haley is one of the performers . Unfortunately , Ellie dies before she sees the CD or the concert , leaving Peyton devastated . A school shooting breaks out later in the season ( `` With Tired Eyes , Tired Minds , Tired Souls , We Slept '' ) , where Peyton is left fighting for her life after being the one shot. Lucas and Nathan run inside the building to save Peyton and Haley ; Lucas finds Peyton bleeding out of her leg inside the school 's library . She can not walk due to the injury , so escaping is out of the question . Lucas and Peyton stay in hiding , and Lucas wraps her leg , hoping to help the bleeding and pain subside . As Peyton is falling in and out of consciousness , he forces her to talk about a fun day she once had . Minutes later , after earning a promise from Lucas about everything being okay , Peyton loses hope of surviving , despite Lucas promising to get her out of there alive ; she kisses him , wanting to let him know that she loves him before she dies . Lucas returns the kiss , and Peyton soon falls unconscious . Lucas , not wanting her to die , carries her out of the building , even at the risk of being killed by the shooter . </P>
when does peyton find out she 's adopted
when does peyton find out she 's adopted
In season 3
In season 3