TMZ Sports has learned she was in a home in Redondo Beach, CA ... south of L.A. -- and police got the call around 7:30 PM. Officers are on scene right now. We're told they are investigating as a possible overdose ... due mainly to her history with drugs.
Chyna was 45-years-old.
A statement was posted to Chyna's official Twitter account confirming the death ... saying, "It is with deep sadness to inform you today that we lost a true icon, a real life superhero."
"She will live forever in the memories of her millions of fans and all of us that loved her.