It serves to give an idea of ​​how unhappy Minnie lived her married life. She had no right to have an opinion and was treated only as her husband's slave. His feelings and needs didn't matter. Minnie's life is the same as the canary in the story: he was "very sweet and cute, but a little shy and fluttering" but as soon as he was put in a cage, there was no more freedom (Glaspell). Her married life isolated her for twenty years and the canary was the only thing that made her happy during her lonely life, but her husband killed him, just like their marriage killed the happy Minnie's youth. According to the two women's investigations, this is why Minnie killed her husband. The amount of stress and mental pressure is unbearable and Minnie has lost her psychological disposition. As one of her peers, Martha Hales, deduced, “A person becomes discouraged and loses heart.”