12. The Getaway

Complete story — includes the ending

As the noose tightens, Arthur warns Dexter to back off. But Dexter will do anything to stop Arthur from eluding him, even if that means putting himself on the wrong side of the law. Rita acknowledges the rocky relationship she and Dexter share, but reaffirms her support. Meanwhile, Batista and LaGuerta face the consequences of their actions and now that they are married agree to move in together. Debra finally learns that Dexter is the Ice-Truck Killer's brother and tells Dexter. She then tells him he is the only constant truly good thing in her life and that she loves him. At the culmination of the episode, Dexter finally captures and kills Arthur, but then goes home to find Rita dead... apparently killed by Arthur hours earlier in the same manner as the other Trinity bathtub victims. Dexter finds his own son, Harrison, alive but sitting in a pool of his mother, Rita's exsanguinated blood --a thematic link back to how young Dexter himself (and brother), sat in the deep puddle of their own murdered mother's blood.