Actor Lea Michele and the late Cory Monteith are shown in this January file photo. REUTERS/Adrees Latif
"Thank you all for helping me through this time with your enormous love & support," Michele, 26, posted on Twitter along with a photo of her and Monteith. "Cory will forever be in my heart."
Monteith, 31, who had struggled with substance abuse, was found dead in a Vancouver hotel room on July 13 from an apparently accidental overdose of heroin and alcohol.
He played Finn Hudson, a high school jock turned glee club singer, in the Fox musical comedy.
The series' fifth season will premiere on September 26, a week later than originally planned so that writers can revise episodes due to Monteith's death.