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Dallas PD

The Texas teenager who allegedly kidnapped and fatally stabbed a 4-year-old boy has been charged with capital murder.

Cash Gernon's body was found on a residential street around 6 a.m. on May 15. Prosecutors say Darriynn Brown kidnapped Cash from his bed and stabbed him to death with an "edged weapon."

Cash and his twin brother, Carter, were in the care of their father's ex-girlfriend, Monica Sherrod, when he was snatched.

Surveillance footage from a baby monitor shows a man who resembles Brown carrying Cash out of the house.

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Dallas PD, YouTube

The Dallas Police Department upgraded Brown's charges to capital murder after forensic evidence linked him to the child.

"Evidence submitted to the lab has been returned linking Darriynn Brown to Cash Gernon at the time of his death," said a statement issued by the Dallas PD.

Brown, 18, reportedly interacted with Cash at Sherrod's home in the days before the murder and was familiar with the family.

A neighbor identified Brown as the same man who broke into his home, attacked him and attempted to kidnap his 2-year-old granddaughter in a separate incident in February.

Brown is charged with burglary and injury to the elderly in that case.