Atlanta police are investigating the death of a child after the Fulton County Medical Examiner ruled it a homicide.

Monte Jones, who would have been 9 months old on Thanksgiving Day, died Nov. 11 after being taken to the emergency room at Hughes Spalding Children’s Hospital two days earlier with serious injuries, Atlanta police spokeswoman Elizabeth Espy said.

The boy’s mother, Jasmine Jones, told police she had gone to work and left Monte and her two other children with a neighbor. She said she was called at work to go to the emergency room.

Monte died from blunt force trauma to the head, and investigators also found evidence of a sexual assault, Lt. Charles. Hampton told Channel 2 Action News.

Jasmine Jones was arrested for unrelated charges for allegedly making terroristic threats in DeKalb County, Channel 2 reported. She is cooperating with police.

Edwina Jones-Burton, Monte’s great-aunt, told Channel 2 she is hopeful someone will come forward with information.

“Somebody, somebody got to step up and pay for this,” Jones-Burton said. “You know it hurts my heart to death to know somebody would do that to a baby.”