Police in Redondo Beach, CA, found the former Celebrity Rehab with Dr. Drewparticipant -- whose real name was Joanie Laurer -- dead in her apartment on Wednesday afternoon after a friend discovered she was not breathing, E! News reported.
Chyna's manager told the website that the WWE entertainer and actress "was found peacefully" without releasing any further details. While Chyna's cause of death remains unknown, authorities reportedly said there were no indications or signs of foul play.
Chyna's team announced her death on Twitter with the following statement late Wednesday night: "It is with deep sadness to inform you today that we lost a true icon, a real life superhero. Joanie Laurer aka Chyna, the 9th wonder of the world has passed away. She will live forever in the memories of her millions of fans and all of us that loved her."
After wrestling for the WWF, Chyna starred on Season 4 of VH1's The Surreal Life in 2005. She later returned to the network in 2007 for The Surreal Life: Fame Games and then again in 2008 for the very first season of Celebrity Rehab with Dr. Drew.
Chyna was treated for alcohol abuse on Celebrity Rehab with Dr. Drew, however she also reportedly battled drug addiction. Prior to Chyna's death, troubled country singer Mindy McCready had been the last participant to die since appearing on the show.
McCready died in February 2013 at age 37 from an apparent suicide only months after former The Real World: Hollywood star Joey Kovar -- who participated in the same Celebrity Rehab third edition as McCready -- was found dead at age 29 from an apparent fatal combination of cocaine, Viagra and alcohol.
Former second-season Celebrity Rehab participant Rodney King was also found dead in his pool at age 47 in June 2012.
In addition, Season 1 and Season 2 Celebrity Rehab cast member Jeff Conaway also died of a drug overdose at 60 years old in May 2011 and third-season participant Mike Starr unexpectedly died in March 2011 at age 44.
Many past and present WWE superstars tweeted their condolences on Thursday after learning about Chyna's tragic death.
"Devastated over Chyna passing, she dated Brutus years before wrestling, such a beautiful soul and so kind to my children, rip Joanie love u. HH," Hulk Hogan tweeted Thursday.
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"Someone who wasn't afraid to blaze her own trail & create a path for those who would follow. A pioneer whose star shined bright. #RIPChyna," Triple H. wrote.
"Shattered glass ceilings, kicked down doors, broke gender barriers, she was an anomaly & untouchable. Rest now-ur legacy lives on #RIPChyna," Trish Stratus tweeted.
"@ChynaJoanLaurer May the peace you were seeking put you at rest my friend. So sorry for not seeing the pain @Mania. We've shared so much," Kevin Nash posted on his Twitter account.
And there were many more kind comments. The WWE organization itself also shared a statement.
"WWE is saddened to learn of reports that Joanie Laurer, best known for competing in WWE as Chyna, has passed away," the organization said. "A physically striking and talented performer, Chyna was a true sports-entertainment pioneer...WWE extends its condolences to Laurer's family, friends and fans."