A nanny has been charged with child abuse in the death of a 4-month-old Omaha boy.

Authorities say 24-year-old Sarah Cullen, of Omaha, was taken into custody on an arrest warrant Thursday night.

She's accused of shaking or otherwise causing a massive head injury to Cash Bell, who lived with his parents in west Omaha.

Chief Deputy Marty Bilek says Cullen took the boy to a hospital on Feb. 28. He was soon flown to Children's Hospital & Medical Center in Omaha, where he died on Tuesday.

A jailer said Cullen remained in Douglas County Jail on Friday. Online court records don't list the name of Cullen's attorney.