"Arrow" season 4 is set to air one of its most emotional episodes tonight as Oliver Queen and the rest of Team Arrow bid their goodbyes to Laurel Lance, who was stabbed to death by Damien Darhk.

Titled "Canary Cry," episode 19 will see the aftermath of that shocking moment in the previous episode when Damien Darhk stabbed Laurel Lance as a revenge for testifying against him. It all happened after the villain got out of prison, ready to punish the team for the headache they had caused him.

Synopsis for the episode says: "Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe had changed."

In episode 18, Oliver already had a hunch that the brother of Diggle was actually working to Damien Darhk. However, Diggle did not want to believe his best friend and even pointed a gun at him when he tried to attack Andy.

The end of the episode showed that Andy's loyalty was still with the enemy of Oliver, and that the heated encounter between the two was what actually caused the death of Laurel.

Episode 19 will also follow Quentin, who is still in denial of the death of her daughter Sarah.

"Lance refuses to believe that his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead," reads the synopsis.

"Arrow" season 4, episode 19 airs on April 27, 8:00 P.M. on The CW. Watch the promo below.