Question: 13 reasons why all deaths?
Answer: Hannah Baker. When did she die? Season one. Hannah Baker's death was the main premise for seasons one and two of 13 Reasons Why. ... 
Jeff Atkins. When did he die? Season one. ... 
Bryce Walker. When did he die? Season three. ... 
Monty de la Cruz. When did he die? Season three. ... 
Justin Foley. When did he die? Season four.