Mexican wrestler César Cuauhtémoc González Barrón died on Saturday during a match. The 51-year-old wrestler, known as Silver King, was in London performing in the Lucha Libre show at the Roundhouse.

“Last night Silver King sadly lost his life during an event at the Roundhouse. At this stage the details are still being investigated so we don’t have more information we can share,” Roundhouse wrote on Twitter. “Our thoughts and condolences are with his family, friends and all of the Lucha Libre team.”

Initially, attendees believed that González collapsing was part of the show. But they quickly realized something went wrong when they had to leave the premises. Paramedics arrived five minutes after being called, but González was pronounced dead at the scene.

Born on January 9, 1968, Silver King began wrestling at a young age. He made his debut in 1985, and two decades later – after working for WCW, Consejo Mundial de Lucha Libre, and  New Japan Pro Wrestling – he starred as the villainous Ramses in Nacho Libre, opposite Jack Black.