HOUSTON -- A mother was charged with capital murder, accused of beating her baby to death, KPRC Local 2 reported Tuesday.

Harris County sheriff's deputies said Jessica Hoosier, 26, told them she beat the child because she was going through a divorce.

Hoosier is accused of leaving the 2-month-old baby in a car seat at her northeast Houston apartment while she went shopping on Saturday.

The father discovered the baby's body later that day, according to authorities.

Investigators said the baby had multiple fractures and was severely underweight.

"He weighed only about 7 pounds, appeared malnourished at the time, has numerous skull fractures, rib fractures, a broken arm," Assistant District Attorney Sylvia Escobedo Newman said. "His injuries were at various stages of healing."

Hoosier originally denied knowing how her son died but later confessed, investigators said.

"She demonstrated to the officers how she hit the child in the head and chest with the hard portion of the palm of her hand," Newman said.

Detectives said Hoosier's two young daughters were not abused. They have been placed in foster care.

The child's father told investigators he did not know anything about the abuse.

Neighbors said they were shocked.

"That's awful. I mean, how could you do that to a baby someone who can't even take care of them own self? You're taking care of the baby, so she must have been going through something terrible for that to happen," Stephanie Jones said.

Hoosier is being held in the Harris County Jail without bond. If convicted of capital murder, she could face the death penalty.