3:09 PM PT -- Lili Reinhart, who plays Betty on "Riverdale," just said on social media, "I'm finding it hard to grasp that he will no longer be around to give long hugs and share his wisdom and kindness with all of us." Lili followed with another tweet saying, "I just can't believe it."

10:43 AM PT -- "Riverdale" execs tell TMZ, "Luke was everything you would hope he would be: an incredibly caring, consummate professional with a giant heart, and a true friend to all."

They continue, "A father figure and mentor to the show's young cast, Luke was incredibly generous, and he infused the set with love and kindness. Our thoughts are with Luke's family during this most difficult time."

We're told they've shut down the set for today.

Luke Perry -- the TV icon and heartthrob who rose to fame on "Beverly Hills, 90210" -- has died after suffering a massive stroke ... TMZ has learned.

Luke passed away Monday morning at St. Joseph's Hospital in Burbank. According to his rep, Luke was surrounded by his children Jack and Sophie, fiance Wendy Madison Bauer, ex-wife Minnie Sharp, mother Ann Bennett, step-father Steve Bennett, brother Tom Perry, sister Amy Coder, and other close family and friends.

As we first reported, he was rushed to the hospital last Wednesday morning after suffering the stroke while at his Sherman Oaks, CA home. According to the emergency dispatch audio -- obtained by TMZ -- paramedics received a call for a stroke at the residence. We're told when EMTs arrived, he was responsive and talking ... but his condition deteriorated.

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His reps said doctors had sedated Luke, hoping to give his brain a fighting chance to recover from the trauma of the stroke ... but apparently, the damage was too extensive.

Born in Mansfield, Ohio ... Luke had a prolific acting career on TV and in movies -- getting his start in the early '80s -- and became a household name on '90210.' After that, his career exploded. Most recently he's had a starring role as Archie's dad on CW's hit show, "Riverdale."

He also filmed a role in Quentin Tarantino's upcoming Charles Manson movie, "Once Upon a Time in Hollywood."

On '90210,' Luke starred as high school stud Dylan McKay for 10 seasons. He also had prominent roles on shows like "Another World," "Oz," "Jeremiah," "Windfall," "John from Cincinnati," and "Body of Proof."

A reboot of '90210' was just announced on Wednesday with the bulk of the original cast, but Luke had not signed on to be a regular on the series. We're told he was down to do a few guest spots, but couldn't commit to more than that due to his "Riverdale" schedule. Perry's '90210' costars Shannen Doherty and Ian Ziering posted messages of support for their friend shortly after his hospitalization.

My heart is broken. I will miss you so much Luke Perry. Sending all my love to your family. ❤️ #LukePerry @MollyRingwald

Luke's "Riverdale" costar Molly Ringwald, who plays his ex-wife on the CW show, tweeted her love to Luke's family. '90210' star Ian Ziering, who played Steve Sanders in the '90s hit, also shared his mourning with an old photo of the 2 of them.

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His "90210" costar, Gabrielle Carteris -- who played Andrea -- tells us, "I am absolutely heartbroken. Luke was a tremendous force in the lives of so many."

The writers' room for "Riverdale" also mourned the actor, and stated they are dedicating Season 3 to Perry.

Luke also did a significant amount of voice acting, lending his talent to cartoons like "Biker Mice from Mars," "Mortal Kombat: Defenders of the Realm," "The Legend of Calamity Jane," "The Incredible Hulk," "Pepper Ann," "Pound Puppies" and many others.

Perry's rep tells us, "The family appreciates the outpouring of support and prayers that have been extended to Luke from around the world. No further details will be released at this time."

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He was 52.

RIP