Newschannel 6 has obtained the autopsy report for Leah Martin.
According to the Tarrant County Medical Examiner's report, Martin's body was found with a plastic bag over her head and plastic wrap around her neck.
The medical examiner says she was asphyxiated and the cause of death is homicidal violence.
Leah Martin disappeared after attending a relative's graduation at the end of May. Her body was found in August in a clandestine grave outside of Graham.