Bobbi Kristina Brown got extremely drunk after partying with her mother Whitney Houston, drew a bath for herself and slept inside the tub at the Beverly Hilton Hotel the night before her mother died, TMZ reported, citing law enforcement sources. Sources also told the entertainment website that lawyers for Bobbi Kristina’s boyfriend Nick Gordon will use this as a defense to claim that he had no role to play in her death.

The report by TMZ said that by the time Bobbi Kristina woke up in the tub, there was water everywhere in the room. The report also claimed that the night Houston died, Bobbi Kristina was rushed to the hospital to be treated for acute alcohol poisoning. Houston’s team allegedly covered the incident up by saying Bobbi Kristina was taken to the hospital due to exhaustion.

Gordon’s attorney Jose Baez knows about the incident and is planning to use this to prove that the 22-year-old died because she simply took too many drugs, causing her death, TMZ reported. Gordon is facing a $10 million lawsuit filed by Bobbi Kristina’s conservator that claims he beat Bobbi Kristina and stole money from her.

Bobbi Kristina died Sunday at the Peachtree Christian Hospice in Georgia, after being found unconscious in a bathtub at her house in Atlanta on Jan. 31. She suffered irreversible brain damage and was initially put in a medically-induced coma. Authorities have said there were bruises on her body when she was found, which Gordon has claimed were from his efforts to revive her.

Gordon was not allowed by Bobbi Kristina’s family to see her while she was being treated, and was reportedly “very upset and disturbed” over her death. Gordon is a person of interest in Bobbi Kristina’s case, which was upgraded to a homicide investigation on Monday. However, Gordon has not been formally charged with a crime.

Houston was found dead in a bathtub in her guestroom at the Beverly Hilton Hotel in Beverly Hills, California, on Feb. 11, 2012. The official coroner’s report said her death was from accidental drowning, and listed cocaine use and heart disease as contributing factors.