Sadly, there is a significant number of the Glee cast who have passed away, either from causes later in life or from more tragic circumstances. Glee premiered in May 2009 and ushered in an era of Ryan Murphy TV shows that, collectively, may still not rival the cultural influence of his original hit series about a glee club at the fictional William McKinley High School. Though American Horror Story may now be more well-known, and American Crime Story more critically acclaimed, Glee, particularly the first season, was a phenomenon.

https://screenrant.com/glee-cast-who-passed-away-actors/