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BROOKFIELD, MO. -- Investigators are calling the case of a northeast Missouri girl's death "dormant," but not closed.

That, after receiving final reports from the Missouri State Medical Examiner's Office.

Mariah Windsor, 15, of Brookfield was found dead in her bed on January 10.

Her body was discovered by her friend, Ryan Woody, 19, of Brookfield.

Windsor’s death had been dubbed "suspicious" by investigators.

Now the final autopsy and pathology reports are back from the State Medical Examiner.

They indicate Windsor died of a rare brain infection. How the Clostridium bacteria got into her brain remains a mystery.

"It is very rare, and that normally this type of infection comes from trauma as a result of head trauma or from brain surgery, neither of which is the case with Mariah Windsor," said Officer Nicky White from the Brookfield Police Department.

The reports go on to say “asphyxia, most likely positional, may have played a role” in the death of the Brookfield High School freshman.

Toxicology tests found no drugs, illegal or otherwise in Windsor’s system. The only thing that showed up was caffeine.

"We continue to investigate this case. The manner of her death at this point is 'undetermined,' and we will continue to investigate circumstances surrounding the last hours of her life," said White.

White told KTVO she is still trying to determine where Windsor had been, who she was with and what she had been doing in the hours before her death on January 10.

If you can help answer any of those questions, you're urged to contact the Brookfield Police Department.

"Unless further compelling evidence comes to light, we'll stand by the M.E.'s (medical examiner's) cause of death, and that's about all we can do at this point," said White.

White said there’s still a window of time prior to Windsor’s death that remains a mystery.