Hulk Hogan is mourning the death of his former co-worker Chyna ... saying he's "devastated" over her death.
Hulk tweeted, "Devastated over Chyna passing,she dated Brutus years before wrestling,such a beautiful soul and so kind to my children,rip Joanie love u."
Stephanie McMahon also weighed in ... saying, "I just heard the tragic news that @ChynaJoanLaurer has passed. She was truly a pioneer in our industry, and she will be missed. #RIPChyna."
The WWE also issued a statement saying the organization is "saddened to learn of reports that Joanie Laurer, best known for competing in WWE as Chyna, has passed away.