The news of Avery Saunders' suicide spread quickly throughout M Country, and the police arrived at the scene of the crime in no time. Even though the Saunders Family mentioned that Avery Saunders' last text message was sent to Ryan Parker, the police didn't consider Ryan Parker a suspect.
This was because the clues left at the scene of the incident, as well as the suicide note Avery Saunders left for her parents, were sufficient to prove that her death was a suicide, not a homicide.
The way cases were handled in M Country was completely different from Z Country, and the Saunders Family had some difficulty accepting this. What made Ian Saunders and Mrs. Saunders even less able to accept it was that, upon meeting Ryan Parker, they were shocked to see his calm demeanor, without a trace of guilt for Avery Saunders' death.