An accountant was electrocuted after the mobile phone she was charging "slipped" into the bath.
Evgenia Shulyatyeva, 26, died within minutes after the device fell into the water she was in.
Her heartbroken mum Vera found her dead at her home in Kirovo-Chepetsk, west Russia.
Now the Russian Investigative Committee is investigating the death, the latest in a string of similar tragedies in the nation.
The alarming number of these cases includes the death of a 10-year-old girl who dropped her phone in the bath in August. It was also plugged into the mains.
And a poker star suffered a fatal electric shock in her bathroom in Russia back in June.
Evgenia's funeral will happen tomorrow in her remote hometown, 620 miles northeast of Moscow.
Devastated friends have paid emotional tributes to Evgenia, who is believed to have been single.
"Sister ... rest in peace .... sleep well .... you are forever in our hearts …" one pal wrote online.
"Call me tomorrow, say that was a just a dream, that this is not the truth."
Another posted: "You were so bright …Sleep well…."
Mum Vera, 53, paid her respects to Evgenia as she aids the Russian Investigative Committee's examination.
Since the spate of similar deaths, experts have repeatedly warned about the dire risks of electrocution from using charging mobile phones in the bath.
Speaking previously after the tragedy of a teenager , Yury Agrafonov, the head of radio-electronic department of Irkutsk State University, said: "Water is a good conductor.
"This is why there was a short circuit when the phone fell into the water.
"If the phone had not been plugged in to 220 volts, the tragedy would not have happened."
