Chyna's manager tells TMZ Sports ... he had recently struck a secret deal with the producers of the TV show "Intervention" to get Chyna help ... but she died before they could start production.
We spoke with Anthony Anzaldo ... who tells us Chyna's closest friends had become concerned about her prescription drug use in recent weeks -- worried that she was over-medicating herself with Ambien and Valium. He's adamant Chyna's issue was ONLY with Rx meds.
Anzaldo says he entered into talks with "Intervention" producers about doing an episode with Chyna -- in the hopes they could get her back on the right path before it was too late.