The cause of Bobbi Kristina Brown's death remains a mystery but her family does not lose hope that the truth will eventually come to light and the person responsible will pay. The singer's aunt Leolah Brown, for one, has no plans to stop the fight until her niece gets justice.

"I have said it once and I'm going to say it again. It ain't over! My sister, Whitney Houston Brown and my niece, Bobbi Kristina Brown, have not left us in vain," Leolah wrote on her Facebook page, adding that justice will be served.

Bobbi Kristina died back in July. In Jan. 31 earlier this year, Houston's daughter was found unconscious in her bathtub in her home in Georgia. She was rushed to the hospital and was in a coma for seven months before she passed away.

Rumor has it that Bobbi Kristina's boyfriend Nick Gordon may have something to do with his girlfriend's death. When the news about Bobbi Kristina's situation first exploded, reports indicated that Gordon and his friend Max Lomas were the ones that found Bobbi in the bathtub.

Gordon is a primary suspect for Bobbi Kristina's death. There were reports that he was physically abusing his girlfriend. On the night he allegedly found his girlfriend unconscious, Radar Online reports that he was intoxicated and was on cocaine.

There are also reports that Bobbi Kristina did drugs prior to her death and that it was the influence of her boyfriend. Witnesses cited by the abovementioned site claim that while she did, she was usually, if not always, with Gordon.

Gordon has denied the accusations and now the Brown family continues to find the person that took away Bobbi Kristina from them.

Three years ago, Bobbi Kristina's mother Whitney Houston was also found in her bathtub in her home in Beverly Hills. However, she was not unconscious like her daughter. She was already dead. The cause of death was allegedly heart attack and cocaine abuse.