The following is from TMZ.com:
WWE Superstar Death — Vicodin and Valium
Former WWE Superstar Eddie Fatu aka Umaga — who died in December — was the victim of a bad combination of drugs, according to the Harris County Medical Examiner in Texas.
Dan Morgan, the supervisory forensic investigator for Harris County, blamed "acute toxicity" — claiming the combined effects of hydrocodone (aka Vicodin), carisoprodol (muscle relaxer), and diazepam (aka Valium) were responsible for the wrestler’s death.
The death was ruled "accidental" — Fatu was 36.
According to the WWE, Fatu was released from his wrestling contract on June 11 for violating the WWE Wellness Program and for refusing to go to rehab.