A concertgoer passed away this Sunday after being pushed out of a mosh pit at Slipknot’s Knotfest.

According to Patch, Richard Valadez, 62, was in the mosh pit during the band’s set at the Hollywood Casino Amphitheatre in Illinois. He was knocked to the ground and had a seizure. It is reported that due to initial confusion, medical attention was delayed.

Valadez was pronounced dead at 11:34 PM local time, according to the Cook County Medical Examiner’s Office. However, the cause of his death has not officially been announced.

Read the full story on Loudwire.