According to Patch.com, a 62-year-old man died after falling to the ground during this past Sunday's (August 11) "Knotfest Roadshow" concert at Hollywood Casino Amphitheatre in Tinley Park, Illinois.

Richard Valadez was pronounced dead at 11:34 p.m. The cause of his death is not yet known, and an autopsy is pending, a spokeswoman for the Cook County Medical Examiner's Office said.

Witnesses told Patch.com that Valadez joined in some of the mosh pits that formed in the lawn section and was knocked to the ground at least once.

About an hour into headliner SLIPKNOT's set, he fell out of the pit and into the grass. As people were trying to help him up, he suffered a seizure and witnesses called for help. Two men performed CPR on him before staff and emergency personnel showed up to assist Valadez.

"They definitely should have handled things better: More emergency presence for one. And a better way for people to alert that they need help," one witness said about the amphitheater staff's response to the incident.

"Overall, the whole venue just screwed the pooch on the entire thing," another witness said. "No communication, no preparation, nothing."

The North American "Knotfest Roadshow" tour is SLIPKNOT's first in nearly three years. Also appearing on the bill are VOLBEAT from Denmark, BEHEMOTH from Poland and GOJIRA from France.