Footballer Emiliano Sala and his pilot were exposed to harmful levels of carbon monoxide in the cockpit of their private plane before it crashed into the English Channel in January, investigators said.
The plane crashed on January 21 off the coast of Guernsey, killing him and his pilot, David Ibbotson.
Toxicological tests on Sala showed a saturation rate of carboxyhemoglobin (mixture of carbon monoxide and hemoglobin) of 58%.
According to the investigators, this is enough to cause convulsions, loss of consciousness and a heart attack.
The investigators also assume that the pilot was also affected by gas exposure.
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