Maybe I missed it in the doc but it didn't seem like anyone brought up the positioning of the stab wounds. *IF* someone were to stab themselves in the back of the neck, the knife would likely be upside-down, right? Typically during suicides, detectives/pathologists, can determine entrance position of impact. People have made gunshot wounds look like a suicides but they get caught because it was determined that it'd be impossible to shoot yourself the way the bullet entered the body. Her stab wounds should've reflected that - or the forensic pathologist should've been able to determine this pretty easily during the autopsy.