Police confirmed that the wrestlers had a lethal level of a chemical found in eye drops in their systems. The chemical can cause damage to the nervous system when mixed with alcohol. Police say that female robbers use the drug to knock out victims but that the two women suspected in this case did not account for the small size of the men when setting the dose.
In the United States, this would be charged as a felony murder if the theory of the police is presented at trial.
Source: Telegraph
