LOS ANGELES - A lawsuit filed Friday by an estate administrator for Bobbi Kristina Brown accuses her boyfriend of giving her a "toxic cocktail" and putting her face down in a bathtub before she went into a six-month coma and died.
The 22-year-old, the only child of pop legend Whitney Houston and singer Bobby Brown, died on July 26, after being found unconscious in a tub in her home in January, in an eerie repeat of her mother's death in 2012.
The complaint was originally filed on June 24 in Fulton County Superior Court in Georgia by a court-appointed administratrix, and an amended complaint was submitted Friday.
It accuses Brown's boyfriend at the time of her death, Nick Gordon, of assault, battery, intentional infliction of emotional distress and stealing more than US$11,000 (S$15,230) from her after she went into a medically-induced coma, the lawsuit said.
The amended complaint also accuses him of wrongful death.
The document describes an argument that allegedly took place between Brown and Gordon after he came home in the early hours of January 31 after a night out, when her body was found in a bathtub.
The lawsuit said Gordon had been "out all-night on a cocaine and drinking binge" and that he came home and accused Brown of cheating on him during a "loud argument" that last about 30 minutes.
According to the complaint, Gordon then "gave Bobbi Kristina a toxic cocktail rendering her unconscious and then put her face down in a tub of cold water causing her to suffer brain damage."
A guest in the house allegedly found Brown in the bathtub, and according to the lawsuit she was "unresponsive, unconscious with a swollen mouth and a tooth hanging loosely from her mouth." Gordon then came in and said "clean up, clean up" to the guests, who attempted to give her mouth-to-mouth resuscitation, the document said.
"After almost six months of suffering, Bobbi Kristina died from" Gordon's actions, the lawsuit said.
Brown's death drew parallels to that of her mother, who was found face down in a bathtub in a Los Angeles hotel on February 11, 2012, on the eve of the Grammy Awards.
Her parents separated in 2006 and divorced in 2007, with Houston awarded custody of their daughter, amid claims of abuse and drug use in the high-profile relationship.