Thirteen Reasons Why by Jay Asher
After Hannah commits suicide, Clay receives the tapes. After listening the tapes he reaches out to Skye, a classmate who is showing suicidal behaviour.
Ending that could have been:
Jay Asher revealed that he originally intended Hannah to survive, but later discarded the idea to pass out a message to his readers, “With suicide there are no second chances. But readers are shown that people can change for better, even after a tragedy.”