Gonzalez, 51, appeared as a champion wrestler and comic villain in Nacho Libre, which starred USA actor Jack Black as a monk who wants to be a masked luchador. In a report from Record.com, the 51-year old was participating in a match against Juventud Guerrera when he suffered the health issue.
Silver King began wrestling in November 1985 at the age of 17 with him going on to wrestle for Mexican promotions that included CMLL, AAA, and UWA. Eventually, the referee checked on Silver King after Guerrera left the ring again, then others, including Guerrera, entered the ring.
The footage (we will not post it here) shows King collapsing.
The London Ambulance Service said medics arrived five minutes after they were called to the Roundhouse on Saturday, but the patient was pronounced dead at the scene.
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The Round said there had been an "incident" at the show but the venue was unable to comment further. Guerrera kicked out, but at this point it appeared that King was for some reason struggling to move.
"All of us were really shocked - it wasn't clear what was happening", Mr Carrera told the BBC.
Barron was the son of another Lucha wrestler Dr Wagner, and his brother Dr Wagner Junior also competed as a wrestler.
A source from The Lucha Blog confirmed later that Silver King did indeed pass away.
King has wrestled on a professional level since 1990, which included being part of the WCW from 1997-2000. He became famous for playing the villain Ramses in the film "Nacho Libre".