An Oklahoma man was arrested and charged with child sexual abuse after his 11-year-old stepdaughter gave birth at their home in Muskogee.

Dustin Walker, 34, and Cherie Walker, 33, were arrested last week and originally charged with one count of felony child neglect each after the child gave birth to a full-term baby at home on Aug. 16, court records show. The parents initially claimed they did not know the child was pregnant, and the child had not been to the doctor in over a year.

The charges against the couple were amended on Monday after DNA test results revealed that the stepfather was a 99.9% DNA match for the baby's father, according to the test shared with NBC News by the Muskogee County District Attorney's Office.

Dustin Walker is accused of sexually abusing the child, who was 1

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