Murphy explained the recent death of Cory Monteith led him to re-create the ending of the successful Fox series.
"The final year of the show, which will be next year, was designed around Rachel and Cory/Finn's story," Murphy said to an audience at a Paley Center event on Wednesday.
"I always knew that, I always knew how it would end. I knew what the last shot was, he was in it. I knew what the last line was, she said it to him. So when a tragedy like that happens you sort of have to pause and figure out what you want to do, so we're figuring that out now."
This news comes one week after the show aired the emotional "Goodbye to Finn" episode, where the cast laid to rest Monteith's character, Finn Hudson.
Murphy added that the series finale will once again honor the late "Glee" star.