Life Sentence

"Life Sentence" is the twenty-third and final episode of the sixth season of Arrow, and the one-hundred-thirty-eighth overall. It aired on May 17, 2018.

Synopsis
With a new ally on his team, Oliver engages Diaz in an epic final battle.

Trivia

 * This episode marks Paul Blackthorne's final appearance as a series regular, and the last episode to be written by Marc Guggenheim and Wendy Mericle who both stepped down from their duties as showrunners.
 * Quentin's death mirrors Laurel's Earth One counterpart from . Both Lances were killed during an incident.
 * The title refers to Oliver serving life in prison.
 * Diaz references the novel Old Yeller after he shoots Quentin, who took the bullet for Laurel. Laurel later mentions it by name when she knocks Diaz off of the roof.
 * Quentin mentions the time he interrogated Oliver in "Damaged".