Dramatic footage from the 1981 FA Cup semi-final shows Spurs fans clambering over barriers after a crush at the Leppings Lane terrace - the same stand where 96 Liverpool fans lost their lives in 1989.
The jury at the Hillsborough inquest was shown the film of the game, which saw hundreds of Spurs fans stream on to the pitch during half-time to avoid the overcrowding.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."
The company’s recently appointed Chief Executive Dara Khosrowshahi said the breach was made by two individuals outside the company.