Naruto finds out about Jiraiyas death in episode 152 of the Naruto series, which is called "Somber News". This episode covers chapters 403, 404, 405, and 416 of the Naruto manga. In this episode, Naruto learns about Jiraiyas death from Tsunade, who tells him that Jiraiya died while fighting the leader of the Akatsuki, Pain. Jiraiyas death had a great impact on Naruto and the course of the series overall.