Karmelo Anthony’s ex-girlfriend reported that he was stalking her hours before he stabbed Austin Metcalf — and he had threatening and violent texts on his phone, the prosecutor revealed at Anthony’s appeal hearing Thursday.

The jury never heard about Anthony’s disturbing history, or about Metcalf’s juvenile criminal record because of a “gentleman’s agreement” with the 19-year-old’s defense ahead of his murder trial,

Collin County Assistant District Attorney Bill Wirskye revealed.

He told the court Anthony’s high school girlfriend confided to an assistant principal at their school that Anthony was stalking after a breakup, and that he was…

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