The autopsy report was made public Wednesday.
In it, the medical examiner says the autopsy was unable to specifically determine how Aguilar died. However, due to the circumstances surrounding her death and the evidence gathered during the autopsy, the medical examiner determined Aguilar's "means of death was most likely a form of asphyxia."
The report also stated that the medical examiner found evidence consistent with that of a sexual assault.
Aguilar was kidnapped Nov. 5 from outside her family's home as she waited to go to school.
Local law enforcement enlisted the help of state and federal agents in a desperate search to find Aguilar and bring her back home. However, 22 days after her kidnapping, agents found her body about 10 miles from where she was abducted.
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Ten days after her body was found, the FBI and Lumberton Police Department announced the arrest of Michael Ray McLellan, who was already in custody for charges related to a different case.
After being connected to Aguilar's kidnapping, McLellan was also charged in an unsolved rape case from 2016. McLellan's DNA connected him to that unsolved rape case.
However, investigators had McLellan's DNA and the rape kit from the 2016 case before Aguilar was kidnapped.
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Robeson County District Attorney Johnson Britt said if law enforcement had properly handled the rape kit, McLelland would have been behind bars and never had a chance to harm Aguilar.
Following an internal investigation, a Robeson County Sheriff's Office investigator was fired and a second employee resigned. Robeson County Sheriff Burnis Wilkins Jr. did not say the Aguilar case was the reason for their firing, but he did say prior to the end of the investigation that they were being investigated in connection to Aguilar's case.