Bobbi Kristina Brown's cause of death is finally known, but won't be revealed to the public any time soon. Reportedly, the Fulton County medical examiner knows what killed the 22-year-old daughter of the now-deceased Whitney Houston, but was ordered by a judge to keep the findings sealed.

Police want Brown's cause of death to remain hidden from the public because they don't want it to interfere with their investigation, TMZ reported. Police in Roswell, Georgia, are still searching for enough evidence for a homicide prosecution.

Brown's boyfriend, Nick Gordon, reportedly has been a suspect in her death, but police have neither arrested him nor charged him with a crime. The 25-year-old has consistently denied he had anything to do with his girlfriend being found facedown and unconscious in a bathtub at her home Jan. 31.

However, certain members of Brown's family are adamant Gordon played a role in the young woman's death. Bobby Brown's sister, Leolah Brown, has repeatedly placed the blame on Gordon, telling "Inside Edition" last week that she believes Gordon murdered her niece.

"This was no accident," Leolah Brown said. "I will never believe this was an accident ... I believe that somebody killed my niece, just like they killed her mother. I don't know who actually murdered Whitney."

In August, Bobbi Kristina Brown's conservator Bedelia Hargove filed an amended lawsuit against Gordon, alleging he gave Houston's daughter a "toxic cocktail" shortly before she was found in the bathtub. The amended complaint also alleged he first argued with Bobbi Kristina Brown and then dragged her into the bathroom. Hargrove initially filed a lawsuit against Gordon in July, claiming he used to physically attack Bobbi Kristina Brown and steal money from her.

Bobbi Kristina Brown never recovered after being discovered in her bathtub. She died July 26 and was buried Aug. 3 next to her mother in a cemetery in Westfield, New Jersey.