It sounds like this 24-year-old man (whose parents lived several blocks from the victim's home) became a person of interest soon after the rape. He was arrested after his DNA was matched with the evidence collected after the crime.
The rapist attempted to terrorize his victim with threats of further violence if the victim didn't keep what happened to her a secret. With the level and type of violence used in the rape, there's no way that threat could be viewed as empty. That continued threat must have been horrific for this girl and her family as they waited for the police to complete their investigation.
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