One Tree Hill is not on, on the 21st April 2008 because the episode on the 14th April was the last episode of the series. Haley James Scott; Deaths in Tree Hill; Dan Scott; Episodes. One Tree Hill (episode) Danny Boy; All Of A Sudden I Miss Everyone ; Know This, We've Noticed; This Is My House, This Is My Home; 4:30 AM (Apparently They Were Traveling Abroad) Last Known Surroundings; Cast Pages.