Last month’s UFC Fight Night 67 in Brazil had plenty of highlights, including big wins for Carlos Condit and Charles Oliveira in the co-main events.

On the undercard, UFC Brasil winner Rony Mariano, who goes by the nom de guerre of Rony Jason, lit up the crowd with his victory over Damon Jackson. The Brazilian, who had lost two of his last three bouts, looked spectacular — securing a triangle choke for the finish and earning a $50,000 performance of the night bonus, to boot.

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But today, it all fell apart.

The Brazilian MMA Commission (CABMMA) has revealed that Jason, seen pictured above (middle) with his team, tested positive for a banned substance after the event — and the result of the bout has been switched to “no-contest.”

The substance in question is hydrochlorothiazide, a diuretic which is sometimes used by athletes to cut weight.

Jason, whose MMA record is now 14-5 (with one no contest), has been suspended for nine months and will likely lose that $50,000 performance of the night bonus.

In a report from MMA Fighting, Jason is quoted as saying he had no issues with the weight cut, and doesn’t know how he tested positive for any banned substance.

“I’m talking to my nutritionist and UFC doctors,” Jason said. “The only thing I used on the day of the weigh-in was vitamin C, so we’re checking if any of the medication I used for my ankle injury has something to do with it.”

The report notes that Jason was the only fighter to fail his test at UFC Fight Night 67.