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The chain apparently caused him to be hurled across the room. We don't know how he died, but given the inverse square law, the possibilities are quite grisly.

He was wearing a twenty pound necklace. In a magnetic field that strong? His throat was crushed, likely instantly.

Do you have a source for that? The BBC just says "a medical episode" of which he died later.

Multiple heart attacks.

That I can well believe!