Rin impaling herself on Kakashi’s Chidori. Rin also used the last of her strength to whisper Kakashi’s name before she died, with her death leaving the enemy ninja stunned and both Kakashi and Obito horrified.
In which episode does Rin die? – Quora. She had already died when the series started but in Obito’s flashback, she died in episode 345 by jumping in front of Kakashi’s chidori when he was about to attack an anbu member.