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Not so far. The highest voltage yet attained for current electricity is 5 million volts: The highest electrical potential ever produced by man, over 5,000,000 volts, has been achieved in the laboratory of Dr. Gregory Breit and Dr. M.A. Tuve at the Department of Terrestrial Magnetism of the Carnegie Institution of Washington.
The resistance of human skin varies between 1,000 ohms (wet skin) to 100,000 (dry), so the lethal voltages are 200V and 20,000V respectively. A 400g heart (the most a healthy heart can weigh) might take up to 27,000V. At high voltages, extra physics comes into play. For example, only ten per cent of lightning strikes are fatal. Most injuries result from arc flash - the intense heat, light and pressure from the sudden heating effect of electrical currents.