Lawsuit alleges Bobbi Kristina Brown's boyfriend gave her 'toxic cocktail'. The estate of Bobbi Kristina Brown has filed a multimillion-dollar wrongful death lawsuit against her boyfriend, alleging he is responsible for the injuries that led to her death last month.

The lawsuit filed Friday alleges Nick Gordon, who shared a townhome with Brown in the Atlanta suburb of Roswell, beat her after an argument on the morning of January 31, then gave her a "toxic cocktail" to knock her out.

It accuses him of placing her face-down in a bathtub of cold water, causing her to suffer brain damage.

The suit seeks at least $10 million.

Brown, the only child of the late Whitney Houston and singer Bobby Brown, was rushed to the hospital after the incident in January and placed in a medically induced coma. She died in hospice care late last month at age 22.