A man, aged 27, was arrested near the scene on suspicion of murder.
A post-mortem will be held at 2pm today at Fulham mortuary.
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The club says the decision to sack Ken Hare was "a disappointment". He had been at Roots Hall for 27 years.
The organisation wants to preserve as many signs as possible to add to their collection of protest art.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.