According to the New York Daily News, Brad was behind his drum kit roughly halfway through the Generation Esmeralda concert when he collapsed forward onto his drum kit.

This 61-second video clip shows the horrifying moment when Brad fell over while his band mates, obviously unaware of the situation and not realizing their drummer was in distress, continued performing:

Roadies and medics eventually rushed the stage and the drummer was taken to a hospital, where he died on Sunday.

The band says in a statement:

"Please honor Brad as we do in his memory and remember him and his amazing talent and for the loving person he was. He died doing what he loved best."