When Michelle O'Connell was found shot dead in the home she shared with her sheriff deputy boyfriend in 2010, police quickly said she killed herself.
But the 24-year-old Florida mother's family insisted she was murdered by her cop partner Jeremy Banks and have demanded justice ever since.
Last year, Banks was told he would not be charged in her death, but results of a new independent autopsy could turn the case on its head.
Dr. William Anderson, who had O'Connell's body exhumed at the request of her family, has said his tests indicate her death was a homicide.
They are set to file the latest report to the medical examiners office and hope they can persuade a prosecutor to convene a grand jury.
Dr Anderson told Crime Watch Daily: 'I believe that the injury patterns that we see are inconsistent with the individual intraoral gunshot wound. We have external trauma and we have significant trauma unrelated to the wound itself.
'That means that someone else was involved in the scenario.'
O'Connell was found dead in the St Augustine home she shared with Banks in September 2010.
She had reportedly packed her bags and was preparing to leave him after their relationship had run into problems.
Friends and family said she had complained about his violence and claimed she had been physically assaulted.
After her death, police conducted a short investigation and quickly cleared one of their own, Banks, insisting the injuries she suffered were from the self-inflicted gunshot wound.
They concluded that no one else was involved.
But, according to the report compiled by Dr Anderson and with the help of two dental experts, her mandible, or jaw bone, was virtually snapped in two before the fatal gun shot.
They also found that the way the gun was placed in her mouth, O'Connell would have been gagging and could even have been choking.
The autopsy states the jaw was broken by blunt-force trauma, suggesting she could have been punched in the face or pistol whipped just before she died.
At the end of the report, the conclusion plainly states: 'The manner of death should be considered Homicide.'
O'Connell's family insist Banks, who is a deputy at the St. John's County Sheriff's department, was behind O'Connells' death. He has never been arrested or changed with the crime.
They claim he used his police expertise to cover up the crime. There has however been no investigation into misconduct of any kind.
'I think he would know how to cover up [the crime],' O'Connell's mother, Patty told Crime Watch Daily.
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