Tyreek Hill ain't exactly off the hook ... prosecutors have reopened the criminal child abuse case involving the NFL star and his fiancee in the wake of a disturbing audio recording, KCTV reports.
The audio went public Thursday night -- capturing Hill in a heated conversation with his fiancee Crystal Espinal ... in which you can hear Hill say, "You need to be terrified of me too, bitch."
During the conversation, Espinal repeatedly accuses Hill of breaking their 3-year-old son's arm -- accusations Hill adamantly denies.
Officials had been investigating the situation -- and while prosecutors determined a crime WAS committed against the child, they could not determine who exactly hurt the boy.