The 100 Things to Do Before High School cast is super-tight, which makes this recent loss even more heartbreaking. Isabela Moner, Jaheem Tombs, and Owen Joyner took to social media to honor Owen's body double, Sean, who passed away. They each honored him in their own way.

Jaheem wrote that he was totally shocked by the news, and couldn't believe that he would no longer see Sean on set.

Isabela wrote a heartfelt message about the loss, and how the world is "losing too many wonderful people."

Owen wrote a sweet message to "one of [his] best friends on set," and it's absolutely heartbreaking. (Since Sean was his body double, it would make sense that they're super-close.)

Our thoughts are with his friends and family.

Are you shocked by this news? Send your kind words to his loved ones in the comments.