Showrunner Ryan Murphy has said that the decision to end the show next season was directly related to the sudden death of Michele's boyfriend, star Cory Monteith.
"It's really [expletive] hard. It's hard. It's hard everyday," Murphy said back in October. "It's hard in the writer's room. It's hard on the set. It just feels like ... It's hard, too, because we're getting ready to wrap up a series. We're going to do one more year and that's it. So, the last scene and the last stories were always very Cory heavy."