<P> In Season 4 , Lucas tries to get Brooke back , but she rejects him , feeling that the passion is no longer there . One day , he hurries to save Peyton from Internet stalker `` Psycho Derek '' , and becomes considerably closer to her afterward . He also helps Karen , who is pregnant with Keith 's baby , and plans on going to the University of North Carolina when he graduates so that he can be close to home in case she needs him . Dan also helps Karen with her pregnancy , wanting to make amends for Keith 's death . After talking with Dan , Karen persuades Whitey to let Lucas play 15 minutes a game , so as not to let him miss out on something he loves . Brooke and Lucas try dating each other again , but realize that it is not what they truly want and is not what is meant to be , prompting Peyton to confess her feelings for Lucas . Lucas then discovers that Nathan is planning to throw the state championship game because of his debts . Lucas plans to prevent this and deliberately fails to take his heart medication in order to play better , but Nathan is inspired by learning that he is going to have a son and they win , with Lucas making the winning shot . During the celebration , Lucas , after receiving Brooke 's blessing , sees Peyton and tells her that she is the girl he has been meant for . The two then share a long - awaited kiss . They become a couple at the after - party , but their happiness is short - lived when Haley gets hit by a car and Lucas tries to tell the paramedics what happened only to suffer a heart attack . As he is in the hospital , Lucas dreams that he is visited by Keith , who shows Lucas what life would have been like if he had been a lesser person . In the end , Lucas realizes that he has to go back to his life because he never told Peyton that he loves her . Lucas wakes up and begins a relationship with Peyton . After the failed attempt of prom in Tree Hill High , the group go on a rescue mission to save Mouth who has become stranded in Honeygrove . They all then crash the local Prom , where he and Peyton have sex with each other for the first time . He begins to investigate Keith 's death , as the Keith in his dream suggested that Jimmy did not kill him , but he also starts getting closer to Dan , who tells Karen he wants a bigger part in Lucas 's life . Lucas discovers the truth about Dan thanks to witness Abby Brown . He attacks Dan after walking in on him and Karen kissing and tells Karen that Dan killed Keith , but Dan convinces Karen that Lucas is delusional and needs help . Lucas then steals Deb 's gun and confronts Dan in front of Karen , having set him up by sending him a message from `` Abby '' . Karen collapses and Lucas fires a warning shot at Dan , telling him not to touch her . Karen is rushed to hospital with eclampsia and has an emergency c - section . Lucas is given a half - sister , who is named Lily Roe Scott when Karen regains consciousness . Later , Dan turns himself in for Keith 's murder . Lucas graduates and gets , as a reward , his book ( An Unkindness of Ravens ) from his mother . That same day , he becomes an uncle with the birth of Nathan and Haley 's son , James Lucas Scott , partly named after him . Lucas is named the godfather of James and announces that he will be assisting Whitey as Nathan 's college basketball coach . </P>
<P> In Season 4 , Lucas tries to get Brooke back , but she rejects him , feeling that the passion is no longer there . One day , he hurries to save Peyton from Internet stalker `` Psycho Derek '' , and becomes considerably closer to her afterward . He also helps Karen , who is pregnant with Keith 's baby , and plans on going to the University of North Carolina when he graduates so that he can be close to home in case she needs him . Dan also helps Karen with her pregnancy , wanting to make amends for Keith 's death . After talking with Dan , Karen persuades Whitey to let Lucas play 15 minutes a game , so as not to let him miss out on something he loves . Brooke and Lucas try dating each other again , but realize that it is not what they truly want and is not what is meant to be , prompting Peyton to confess her feelings for Lucas . Lucas then discovers that Nathan is planning to throw the state championship game because of his debts . Lucas plans to prevent this and deliberately fails to take his heart medication in order to play better , but Nathan is inspired by learning that he is going to have a son and they win , with Lucas making the winning shot . During the celebration , Lucas , after receiving Brooke 's blessing , sees Peyton and tells her that she is the girl he has been meant for . The two then share a long - awaited kiss . They become a couple at the after - party , but their happiness is short - lived when Haley gets hit by a car and Lucas tries to tell the paramedics what happened only to suffer a heart attack . As he is in the hospital , Lucas dreams that he is visited by Keith , who shows Lucas what life would have been like if he had been a lesser person . In the end , Lucas realizes that he has to go back to his life because he never told Peyton that he loves her . Lucas wakes up and begins a relationship with Peyton . After the failed attempt of prom in Tree Hill High , the group go on a rescue mission to save Mouth who has become stranded in Honeygrove . They all then crash the local Prom , where he and Peyton have sex with each other for the first time . He begins to investigate Keith 's death , as the Keith in his dream suggested that Jimmy did not kill him , but he also starts getting closer to Dan , who tells Karen he wants a bigger part in Lucas 's life . Lucas discovers the truth about Dan thanks to witness Abby Brown . He attacks Dan after walking in on him and Karen kissing and tells Karen that Dan killed Keith , but Dan convinces Karen that Lucas is delusional and needs help . Lucas then steals Deb 's gun and confronts Dan in front of Karen , having set him up by sending him a message from `` Abby '' . Karen collapses and Lucas fires a warning shot at Dan , telling him not to touch her . Karen is rushed to hospital with eclampsia and has an emergency c - section . Lucas is given a half - sister , who is named Lily Roe Scott when Karen regains consciousness . Later , Dan turns himself in for Keith 's murder . Lucas graduates and gets , as a reward , his book ( An Unkindness of Ravens ) from his mother . That same day , he becomes an uncle with the birth of Nathan and Haley 's son , James Lucas Scott , partly named after him . Lucas is named the godfather of James and announces that he will be assisting Whitey as Nathan 's college basketball coach . </P>
when does lucas find out dan killed keith
when does lucas find out dan killed keith
Season 4
Season 4