The scene of Hannah Baker killing herself is shown at the beginning of the series. Hannah Baker, who happens to be a 17-year-old schoolgirl, actually killed herself by slitting her very own wrist after suffering a whole lot of depression. The last experience she has that leads to the seeming end of life for her is her meeting with Mr. Porter, a school counselor, who tells her that she has just two options; either to reveal the name of the person that raped her, or she should move on with her life.
When she hears this, she goes on to get a park of blade forms a drug store that belongs to her parent; then, she makes her way home. When Hannah gets home, she goes straight to the bathtub and turns it on, and then she enters it with her dress. She uses the razor to slice deep into her wrist, and she bleeds to death.