KANSAS CITY, Mo. (AP) — A 31-year-old Kansas City, Missouri, man is accused of beating a 15-month-old boy who later died of his injuries.

Littlefield, Nathaniel

Littlefield, Nathaniel

Jackson County Prosecutor Jean Peters Baker charged Nathaniel Littlefield with child abuse and child endangerment. Those charges were filed before the child died early Wednesday.

According to court records, Littlefield was supervising the boy and his brother Sunday while their mother, who was Littlefield’s girlfriend, worked.

The mother later found the 15-month-old unresponsive and took him to a hospital. Doctors say the boy sustained severe head trauma and a lacerated liver.

Littlefield reportedly told investigators he hit the boy in the head to resuscitate him, and that he left the children home alone while he picked up their mother from work.

Online court records don’t show whether Littlefield has an attorney.