Death is unlikely. Respiratory depression / lowered heart rate, possibly sleeping for 24 hours plus likely, but it's not likely to kill you unless by some fluke you have an underlying condition you don't know about and you combine it with other respiratory depressants.
Even in combination with other drugs it's Russian roulette. Weight, metabolism, underlying conditions, if the moon is in retrograde (eh, joking re last bit)…. But it's down to the luck of the draw.