What events led to Gregor‘s death in the metamorphosis?

Gregor's death is preceded by his alienation and loneliness. Grete's impassioned speech, however, marks the climax of the novel. The conflict, at this point, comes to a close. The family at least realizes that Gregor, who has become the symbol of their alienation, is the problem and has to be gotten rid of. A reversal has taken place. Gregor, in undergoing is metamorphosis, cast aside his duty to his family in order to find his freedom. Now the family wants to cast aside their duty to him in order to find their own freedom.

Struck by the music of the violin and the recollection of his humanity that it brings on, Gregor suddenly remembers his duty once more. At the moment when his family has abandoned their duty to him, he realizes that he must once again sacrifice himself for their happiness. Gregor once again feels love and tenderness for his family. As a result, Gregor regains the element that has been missing from his freedom. His duty flares up, reminding him that his family's happiness is more important to him than his freedom or even his life. Gregor dies by his own choice, realizing that his death is essential to his family's happiness.