Question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Who killed Crowe? Title: The Sixth Sense Movie plot: Dr. Malcolm Crowe, a child psychologist in Philadelphia, returns home one night with his wife, Anna, after having been honored for his work. Anna tells Crowe that everything is second to his work, and that she believes he is truly gifted. Just then, a young man appears in their bathroom, and accuses Crowe of failing him. Crowe recognizes him as Vincent Grey, a former patient whom he treated as a child for hallucinations. Vincent shoots his former doctor before killing himself. The next fall, Crowe begins working with another patient, 9-year-old Cole Sear, whose case is similar to Vincent's. Crowe becomes dedicated to the boy, though he is haunted by doubts over his ability to help him after his failure with Vincent. Meanwhile, he and his wife seldom, if ever, speak or do anything together. Crowe feels he must help Cole in order to rectify his failure to help Vincent and reconcile with his wife. Cole's mother, Lynn, who truly loves him, worries about his social stamina, especially after seeing signs of physical abuse. Cole eventually confides his secret to Crowe: he sees ghosts, who walk around like the living unaware they are dead. At first, Crowe thinks Cole is delusional and considers dropping his case. Remembering Vincent, the psychologist listens to an audiotape from a session with Vincent when he was a child. On the tape, when Crowe leaves the room, and then returns, Vincent was crying. Turning up the volume, Crowe hears a weeping man begging for help in Spanish, and now believes that Cole is telling the truth and that Vincent may have had the same ability. He suggests to Cole that he should try to find a purpose for his gift by communicating with the ghosts and perhaps aid them with their unfinished business. At first, Cole is unwilling since the ghosts terrify and sometimes even threaten him, but he finally decides to do it. Cole talks to one of the ghosts, Kyra Collins, a young girl who recently died after a chronic illness. He goes with Crowe to her funeral reception at her home, where Kyra directs...
Answer:
Vincent