Gregers returns, stunned to find that the couple are not overjoyed to be living without such a lie hanging over their heads. Mrs. Sørby arrives with a letter for Hedvig and news that she is marrying Håkon. The letter announces that Håkon is paying Old Ekdal a pension of 100 crowns per month until his death. Upon his death, the allowance will be transferred to Hedvig for the remainder of her life. The news sickens Hjalmar even further, and it dawns on him that Hedvig may very well be Håkon's child. He cannot stand the sight of Hedvig any longer and leaves the house to drink with Molvik and Relling. Gregers tries to calm the distraught Hedvig by suggesting that she sacrifice the wild duck for her father's happiness. Hedvig is desperate to win her father's love back and agrees to have her grandfather shoot the duck in the morning. The next day, Relling arrives to tell the family that Hjalmar has stayed with him. He is appalled at what Gregers has done, and he reveals that he long ago implanted the idea of the invention with Hjalmar as a "life-lie" to keep him from giving in to despair. The pair argue as Hjalmar returns to gather his materials to work on the invention. He is overwhelmed by the number of details involved in moving out of the apartment. Hedvig is overjoyed to see him, but Hjalmar demands to be 'free from intruders' while he thinks about his next move. Crushed, Hedvig remembers the wild duck and goes to the loft with a pistol. After hearing a shot, the family assumes Old Ekdal is hunting in the loft, but Gregers knows he has shot the wild duck for Hedvig. He explains the sacrifice to Hjalmar who is deeply touched. When Old Ekdal emerges from his room, the family realizes he could not have fired the gun in the loft. They rush in to see Hedvig lying on the ground. No one can find a wound, and Relling has to examine the girl. He finds that the shot has penetrated her breastbone and she died immediately. Given the powder burns on her shirt, he determines that she shot herself. Hjalmar begs for her to live again so that she can see how much he loves her. The play ends with Relling and Gregers arguing again. Gregers insists that Hedvig did not