RadarOnline.com has obtained an explosive letter Elvis Presley 's granddaughter, Riley Keough , sent to her grandmother, Priscilla Presley , sharing her shock and grief after Priscilla was accused of " pulling the plug " on daughter Lisa Marie in an alleged attempt to gain sole control of the King's legacy .

The revealing letter is part of a larger lawsuit battle between Priscilla and her former business partners over accusations of fraud. Article continues below advertisement

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Priscilla, 80, had previously accused her former partners of elder abuse and financial fraud .

In response, defendants Brigitte Kruse and Kevin Fialko filed a countersuit demanding $50million and allege in court documents that Priscilla "ignore

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