In a shocking revelation, Rey Mysterio reveals in his newly released autobiography, Rey Mysterio: Behind the Mask, that he checked himself into a drug rehabilitation center last year as a result of a persistent issue with legal pain medication.

Wrestling Observer editor Dave Meltzer says it was due to lingering problems he had with his biceps last year. If you recall, Mysterio suffered a biceps injury during an overseas tour in February and underwent three surgeries within the space of a month to correct the problem.

For more details on the book — which will be officially released this Tuesday — click here.

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