Boone reveals to Jack that he and Locke have discovered the hatch, and Locke has told him not to tell anybody else. Despite Jack's extensive attempts to save him, Boone dies. Shannon & Sayid have a candlelit dinner. Claire goes into labor and gives birth to a boy. Shannon is devastated over Boone's death. Flashbacks show Jack's wedding to Sarah, a former patient whom he had "fixed" after she was injured in a car accident.
(From Wikipedia)
