Gretchen was found stabbed to death on Mount Hope Drive. Police said she was attacked on her way to school.
Investigators are looking to see if there is any connection between Gretchen's murder and the attack on another young girl last week. That girl was walking to Hackett Middle School when a man tried to kidnap her.
She was cut on her hand, but managed to escape.
Police have interviewed the girl, along with several witnesses and have released a sketch of the suspect.