Bobbi Kristina Brown autopsy in the works as police investigate her death

An autopsy will be conducted evaluate what led to the death of Bobbi Kristina Brown as the police continue to investigate the circumstances surrounding her death, authorities said Monday, the day after her death.

"The Roswell Police Department continues its investigation into the circumstances preceding and surrounding the time of the original incident leading to her death," the medical examiner said in Monday morning's statement. Initial autopsy reports found no obvious cause of death, medical examiners said Monday afternoon.

Nick Gordon, who shared her townhome with the daughter of the late Whitney Houston, said at the time it seemed Bobbi Kristina wasn't breathing and lacked a pulse before help arrived. Multiple reports claim Gordon is at the center of the investigation and could face murder charges.

WATCH: A young Bobbi Kristina duets with Whitney Houston

Fulton County District Attorney Paul Howard said he and his office are interested in reviewing the investigative file to determine whether any charges will be filed.

In a statement Monday morning, the Fulton County Medical Examiner's Office says the time that elapsed from when she was found unresponsive in January until her death Sunday will "complicate" its effort to reconstruct events.

"Interpretation of autopsy findings and other information will also be challenging," the medical examiner's office said in the statement. "However, an autopsy could be helpful to address questions which may arise about the cause of her unresponsiveness and eventual death."

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The medical examiner did not release a timeframe for the autopsy, but said additional lab testing might take several weeks.

Relations between Gordon and some other relatives soured over the past year after Bobbi Kristina was hospitalized. A protective order barred him from being within 200 feet of Pat Houston, Bobbi Kristina's aunt. A feud erupted over whether Gordon could visit Bobbi Kristina while she stayed in the hospital.

On June 24, Bobbi Kristina's court-appointed representative sued Gordon, accusing him of misrepresenting his relationship with Bobbi Kristina. The complaint accused him of being violent toward her and taking more than $11,000 from her account while she was in a medically induced coma.

The lawsuit also accused Gordon of assault, battery, intentional infliction of emotional distress, unjust enrichment and conversion.

By January 2014, the young couple who grew up as brother and sister were living together and calling themselves husband and wife.
They posted images of their hands wearing wedding rings, with the caption "#HappilyMarried. So #InLove. If you didn't get it the first time that is." They got identical "WH" tattoos with flying doves on their wrists, and Gordon added a large portrait of Houston's face on his arm.

Their marriage announcement troubled Pat Houston, who obtained a restraining order against Gordon two months later.

Bobbi Kristina’s father, singer Bobby Brown, has stated his daughter and Gordon were never legally married.

A lawyer for Gordon did not return FOX411's request for comment.

The Associated Press contributed to this report.