The second season consisted of 23 episodes and ran from September 21, 2004 to May 24, 2005.
After Lucas and Keith learn of Dan's heart attack, they return to Tree Hill and Dan decides he wants to get to know Lucas. Lucas cautiously enters into a relationship with his father. After Dan learns that Lucas has inherited his hypertrophic cardiomyopathy (HCM), the genetic defect which caused Dan's own heart attack, he convinces Lucas to move in with him and pays for his medication, keeping his condition a secret. Dan also agrees to stay away from Keith and his girlfriend Jules (guest star, Maria Menounos)...
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