Behind the Scenes of 'Riverdale' Season 4 (PHOTOS)

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KJ Apa/Instagram; Roberto Aguirre-Sacasa/Instagram; Madelaine Petsch/Instagram
Mädchen Amick/Instagram

Mädchen Amick posted a photo of the premiere table read on July 8.

“There was nothing but love, memories and mourning for our beloved Luke as we honor him in our first episode back #wemissyouluke,” she wrote.

Marisol Nichols reposted the photo, adding, “Dedicated to Luke. We love you, man. Honoring you the best way we know how.”

Roberto Aguirre-Sacasa/Instagram

Aguirre-Sacasa posted this photo from the Season 4 premiere on July 14.

“A BTS shot from yesterday’s filming,” he wrote in the caption. “The end of an intense week for our #Riverdale family. Really emotional, beautiful work being done by the cast and crew.”

KJ Apa/Instagram

KJ Apa posted a behind the scenes photo from the filming of the premiere.

“Lots of love this episode. directed by my brother @gabrielcorrea,” he wrote on July 14. “Couldn’t imagine anyone else doin the job!”

Madelaine Petsch/Instagram

Madelaine Petsch posted this photo of herself and Vanessa Morgan with the caption, “back to your regularly scheduled programming,” on July 8.

Roberto Aguirre-Sacasa/Instagram

Roberto Aguirre-Sacasa kicked off filming by posting this photo of Apa from the second day of shooting on July 9.

Vanessa Morgan/Instagram

Morgan teased an upcoming Choni scene with this photo alongside Petsch.

“First day of Season 4 & we get to lay in bed all scene hayyyy,” she wrote in the caption on July 8.

Roberto Aguirre-Sacasa/Instagram

“The Bulldogs are back on this season of #Riverdale,” Aguirre-Sacasa revealed with this photo on July 23. “Filming on the same field we did in the pilot!”

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Riverdale's fourth season may not be premiering until October, but the cast has already begun filming and sharing looks behind the scenes at what to expect.

It all begins with the emotional premiere, which pays tribute to the late Luke Perry and his character, Fred Andrews, and features a special guest star in his Beverly Hills, 90210 costar, Shannen Doherty.

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KJ Apa, Lili Reinhart, Cole Sprouse, Camila Mendes, and Madelaine Petsch talk the bonfire finale scene, Cheryl's state of mind, and more.

Click through the gallery above to see the photos the cast and producers have shared on social media from the set.

Riverdale, Season 4 Premiere, Wednesday, October 9, 8/7c, The CW