I don't think there is any question as to what happend to Tera and who did it.
The problem is and I have been involved in many cases where we just didn't have the evidence.
They have reasonable suspicion agianst this guy maybe even probable cause to arrest. But they can't meet the burden of proof beyond reasonable doubt. So this scum bag walks and Tera is left in a shallow grave located in a isolated area. This person will mess up again it's in his blood and when he does law enforcement needs to hammer him.