Joan Rivers — Sources Says Someone Screwed Up

EXCLUSIVE

Someone did something incorrect in the medical procedure that led to Joan Rivers‘ death … this according to one source caught up in the investigation.

The Medical Examiner has said the death was the result of a therapeutic, predictable complication. Sources tell us … the complication did NOT involve the Propofol administered to Joan. The complication was the result of the procedure itself.

The source connected to the investigation tells TMZ … the procedure was really completed when Joan suffered brain hurt from a lack of oxygen.  

Our source says there were no “underlying causes or contributing factors” involving Joan’s shape, and it appears someone was at fault. There’s still an investigation and a big issue is whether her oxygen levels were being properly monitored.  

We’re told people in Joan’s life have keyed in on the word “predictable” … they think it could be a focal point in a possible malpractice action because predictable could also mean preventable.