Grishall Disner, 23, left the table where he was drinking in Kows Bar in Mexico City on Wednesday night to go to the bathroom shortly before two gunshots were heard.
Horrified drinkers rushed to the toilet after hearing the shots where they found Disner with bullet wounds to the stomach and head, according to reports.
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Some local media reports have said that Disner had been drinking heavily before he went to the bathroom.
It is thought that Disner "shot himself", though the police continue to investigate alternate theories.