Bobbi Kristina Brown died due to “injection of a toxic mixture” by Nick Gordon, according to a new legal document filed by Brown’s court-appointed conservator Bedelia Hargrove.
“Ms. Brown died due to a violent altercation with Defendant (Gordon) after which he placed her in a bathtub, unconscious, after he injected her with a toxic mixture,” reads the filing obtained by local Atlanta affiliate WSB-TV.
The latest documents were in response to a motion filed by Gordon asking the court to stop the lawsuit claiming he caused the “wrongful death” of the 22-year-old daughter of Whitney Houston and Bobby Brown.
Gordon’s lawyers tell PEOPLE that the new accusations are “meritless and slanderous.”
In the original August lawsuit – which was amended after Brown’s death – there was no mention of an injection.
Hargrove’s suit also claims Brown died “after a particularly violent altercation with the Defendant (Gordon) which left her battered and bruised, with a tooth knocked out.”
In addition, the documents accuse Gordon of receiving $40,000 to allow a magazine to take pictures of him at Brown’s grave.
Brown died July 26 surrounded by her family in a hospice nearly six months after she was found unresponsive in her Roswell, Georgia home she shared with Gordon.
Gordon has previously denied allegations he physically abused Brown including claims that he hit her face, kicked her side and knocked out her tooth.
• With reporting by ELISSA ROSEN