Voldemort feels the Elder Wand is not performing as expected. Reasoning that Snape, having killed Dumbledore, is its true owner, Voldemort murders Snape. Harry arrives as Snape dies, and Snape passes him memories to view in the Pensieve. They reveal Snape loved Harry's mother, and had acted as a double agent against Voldemort. He had watched over the trio, conjuring the doe Patronus. It is also revealed that Dumbledore was dying after mishandling the ring Horcrux, and had planned his "murder" at Snape's hands. Harry also learns that he is a Horcrux, unbeknownst to Voldemort, and must die at Voldemort's hands to render him mortal. Harry gives himself up, instructing Neville Longbottom to kill Nagini. On the way, he uses the Resurrection Stone within the Snitch to reunite with deceased loved ones. He loses the stone as he meets Voldemort, who casts the Killing Curse on him.