Grandparents from suburban Chicago have been charged with murder in the beating death of their 5-year-old granddaughter, who was whipped a dozen times with a belt for defecating on herself — with the granddad allegedly confessing to being "a little too rough" during the fatal assault.

Illinois prosecutors on Monday revealed horrifying details related to the July 14 killing of 5-year-old Jada Moore, telling the court that the girl had been subjected to beatings for more than two months, leaving her with severe contusions most commonly seen in car crash victims, reported NBC Chicago.

The victim's grandparents, Klent Elwoods, 62, and his wife, Lisa Jones, 57, from Park Forest, have been arrested and charged with first-degree murder in Jada's death, which the Cook County Medical Examiner's Office has ruled a homicide caused by multiple injuries due to child abuse.

The horrific crime came to light when police and paramedics were dispatched to the couple's home on Osage Street after 11 p.m. Friday for a report of an "unresponsive" child.

Elwoods was the person who called 911, admitting to a dispatcher, "I was beating my little granddaughter and now she is out of it," prosecutors said.

Officers found Jada "lying on the couch completely nude."

EMTs performed CPR on the girl before she was airlifted to Comer Children's Hospital, where she died early Saturday.

The grandfather was quoted as telling the police that he began beating Jada after she soiled her underwear, according to a police report obtained by Law&Crime.com.

While he was riding in the back of a police cruiser, Elwoods allegedly said, unprompted: "I was a little too rough with my grandbaby."

When questioned by police, Jones allegedly said her granddaughter "had a history of 'pooping' on herself," and that the last time she had a bathroom accident, Elwoods warned her that he would whip her with a belt if she were to soil herself again.

The grandfather allegedly made good on his threat when he discovered Friday night that the 5-year-old had yet again gone to the bathroom on herself.

"Elwoods then reminded [Jada] what he would do if she defecated on herself again," the report stated.

"Elwoods then grabbed a belt and had [Jada] bend over. Elwoods then proceeded to strike [Jada] on her buttocks between 10 and 12 times."

With each blow, the child fell on the floor, her grandmother was quoted as saying.

The last time she was struck, the 5-year-old did not get back up.