On Thursday, Johnston County deputies responded to the intersection of Highway 39 and Little Divine Road in Selma.
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When they arrived they found 40-year-old Maria Frias McCann had been stabbed. She was taken to WakeMed in Raleigh for treatment but later died from her injuries.
Deputies said 20-year-old Cody Austin Klein got into an argument with McCann and stabbed her several times.
McCann is the ex-girlfriend of Klein's father.
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He was initially charged with assault with a deadly weapon, but those charges were upgraded to first-degree murder upon McCann's death.
Klein is being held in the Johnston County Detention Center without bond.