Note : This post is a developing story about Rey Mysterio passing, we are yet to confirm the details from a press statement. He had much ahead of him.". Rey Mysterio Cause of death? This created a mild panic among the diehard ones. I and the WWE universe pray for your peace an comfort to your family! "It makes me very sad because he was a professional colleague and I have great affection for his father," wrestler Hijo del Santo said in a telephone interview. Social media platforms made discussions on professional wrestling. Other countries train for years. Mysterio has been a subject of several DVDs during his wrestling career, including Rey Mysterio: 619, a 2003 documentary of Mysterio's career and personal life.