'sports fans will kill to watch a match.' That's a little insensitive

The deaths were caused by mismanagement of the crowd by the police, who then spent the next 30 years falsifying witness statements and smearing the supporters in order to hide their culpability.

Jelly is the gelatin based stuff that the meat chunks are embedded in. Jelly is a cover-all term for gelatin based foodstuff including aspic and what Americans call Jello.