Broadway star Josh Grisetti, known also for his final-season turn in “The Marvelous Mrs. Maisel,” has died by suicide, leaving the theater community both blindsided and shocked. He was 44.

Close friends and former co-stars Rob McClure and Sierra Boggess announced his death late Sunday in separate Instagram posts, and his agent Rick Ferrari confirmed it Monday, telling Entertainment Weekly, “I’m absolutely devastated. That’s all I can say.”

“It is with a shattered heart that I share that the brilliant Josh Grisetti took his own life on Friday,” wrote McClure, who co-starred as Grisetti’s brother in “Something Rotten!” both on Broadway and on tour. “I’m not ready to even attempt to understand. My heart is with his wife and family as they try to deal with the reality of this.”

Survivors include his wife, Mackenzie Grisetti.

Sierra Boggess, who starred opposite Josh Grisetti in “It Should Have Been You” on Broadway in 2015, shared the news “ with the deepest grief” as she struggled to process the “heartbreaking” loss.

“Nothing I can say will make this hurt any less,” Boggess wrote. “We all loved him so unbelievably much. He created light and thought and humor everywhere he went.”

Grisetti also taught acting and musical theater as a tenured associate professor at the University of California Fullerton, where he helmed the school’s undergrad musical theater program. Tributes poured in not only from fellow performers but also from students, many of them saying he had changed their lives.

“He was the man of a thousand faces,” Ferrari told E! News in a statement Monday. “His students at Cal State Fullerton theater program cherished him. He shared his gift with everyone who wanted it. We are stunned and heartbroken.”

About two days before his death, Grisetti exited a production of “Legally Blonde” that he’d been directing at the Trentino Music Festival in Fiera di Primiero, Italy, just before opening night. In what would be his last Instagram post, he shared photos and a video of the cast holding up a picture of him in a group shot and shouting in unison, “We love you Josh!”

“When you have to leave a production for personal reasons before getting to see the show open, and the cast and team do stuff like this…” Grisetti wrote. “Literally cried on the plane… little gestures go a long way when your heart is hurting… Love this group of misfits right back!!”

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