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Elvis Presley was Priscilla Presley 's "first victim" ... at least according to her former business partners, who sued her for $50 million and previously claimed Priscilla took Lisa Marie Presley off life support when her heart stopped ... but Priscilla vehemently denies the claims.

Elvis' ex-wife is locked in a bitter legal feud with Brigitte Kruse and Kevin Fialko ... and they just amended their lawsuit against Priscilla with some explosive claims ... namely, that she is responsible for Elvis' death. Getty

In the amended complaint, obtained by TMZ, Kruse and Fialko claim Priscilla pressured Elvis to his death when she placed a lien on Graceland.

Priscilla's lawyer, Marty Singer , tells TMZ ... "These claims by Brigitte Kruse are absurd and ridiculous. W

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