What killed John Sheridan and his wife, Joyce?

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John Sheridan — former CEO of the Cooper Health System, a giant in New Jersey — and his wife were found dead on September 28 after firefighters responded to a fire at their Montogomery home. While local officials in the area ruled that the fire was set intentionally, they won’t say if the fire was what led to the deaths. The couple were remembered at a memorial service attended by Chris Christie, George Norcross and others.