Mr. Monteith played Finn Hudson, an Ohio high school student and football star who initially had no interest in joining his school’s struggling glee club for fear it would cost him his popularity and social standing.

But once drawn into the singing group, Finn became a crucial member, sharing vocal duties on its signature cover of Journey’s “Don’t Stop Believin’,” and also sharing romantic tensions with his fellow students Rachel (Lea Michele) and Quinn (Dianna Agron). In recent episodes Finn graduated from high school but returned to coach the glee club.

“Glee,” which has finished its fourth season, is one of Fox’s biggest hits of recent years, especially with younger audiences, although its ratings have been dropping for the last two seasons.

A press representative for Fox said on Sunday that production on a new season of “Glee” was scheduled to begin later this month or in early August, and that no decision had been made about how the show might deal with Mr. Monteith’s death.

In March, Mr. Monteith announced that he had checked himself into a treatment center for an unspecified substance addiction. He acknowledged in an interview in 2011 that he had also sought rehabilitation when he was 19.