Nick Gordon, Bobbi Kristina Brown Nick Gordon, Bobbi Kristina Brown

Bobbi Kristina Brown's conservator has filed court documents that accuse Brown's boyfriend, Nick Gordon, of causing her death by giving her a "toxic cocktail," People reports.

Back in June, Brown's court-appointed conservator filed a complaint against Gordon accusing him of domestic abuse against Brown. But on Friday, the document was amended to include an allegation that Gordon caused Brown's "wrongful death" by giving her a drink that made her unconscious and putting her face-down in water.

"Consistent with and to the letter of the civil action I initially filed on behalf of Bobbi Kristina, we will continue to pursue justice for her," the conservator, Bedelia C. Hargrove, told People in a statement. "I have filed today an amended complaint against Nicholas Gordon adding a count for wrongful death and for pain and suffering. We will leave no stone unturned in seeking justice for Bobbi Kristina Brown."

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The complaint, as reported by People, alleges that Gordon arrived home at 6 a.m. on Jan. 31 after an all-night "cocaine and drinking binge" and got into a screaming match with Brown, in which he accused her of cheating on him. Gordon then gave Brown the "toxic cocktail" and put her in the bathtub, then left the bedroom and laid down with another female who was in the house at the time, according to the documents.

Fifteen minutes later, after someone else in the house went to check on Brown and found her unconscious with a swollen mouth and loose tooth, Gordon allegedly rushed back in and drained the tub, and began slapping Brown and performing CPR on her in an attempt to revive her.

Representatives for Gordon, who has not been charged with any crimes, responded with their own statement, calling the complaint "slanderous and meritless."

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"Nick has been heartbroken and destroyed over the loss of his love and it's shameful that such baseless allegations have been presented publicly," his attorneys told People.

Gordon entered rehab in March after an interview with Dr. Phil. Brown's family members have repeatedly clashed with Gordon during the entire ordeal, at one point banning him from seeing her in the hospital and later,from her funeral.

Brown, 22, was found unresponsive in a bathtub at her Georgia home in January by Gordon and a friend, and never regained consciousness before she died on July 26. An initial autopsy was inconclusive as to her cause of death.