Police in southwest Alabama say child abuse by a mother and her boyfriend killed a three-year-old boy.

Tatanya Edwards turned herself in on Friday and Abraham Hatch turned himself in on Sunday, local news outlets report. Mobile police charged Edwards with felony murder and Hatch with capital murder. Both remained in jail on Monday.

The boy died Wednesday in a Mobile hospital after being found unresponsive and in cardiac arrest days earlier. Police said he had suffered severe head trauma and other injuries.

Investigators say an autopsy of the boy shows that he had been abused “over some time.”

Mobile police say the 19-year-old Hatch was dating the 26-year-old Edwards during the time the abuse occurred.