Depending on the design of the 'charger', there could be a direct connection of the 120 vac to the '5 vdc'. This occurs in some chargers that do not use isolation transformers or other means to isolate the 120 vac input from the 5 vdc output. My GUESS, this was an inexpensive (aka knockoff) charger. Electrocution can occur at low voltages, as it is CURRENT that kills. If I recall correctly, 5 mlliamperes to 50 milliamperes can result in irregular heart beats, and above that heart stoppage. Siting a tub of highly conductive water would allow a much lower voltage to create the deadly current flow.
Hope this was not too technical.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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