This image provided by the Chicago Police Department shows Manuela Rodriguez. The Chicago woman is charged in the death of her 7-month-old granddaughter, who was struck in the head multiple times before having her throat cut with a power saw, prosecutors announced Tuesday March 10, 2015. (AP Photo/Chicago Police Department)

A 9-month-old infant was reportedly beaten and had her throat sliced with a power saw by her grandmother in Chicago’s Little Village neighborhood, according to CNN.

Manuela Rodriguez was babysitting her granddaughter Rose Herrera on March 9 when she made a call to her sister, prosecutors said, as quoted by ABC7 Chicago.

“The defendant admitted to her sister that she’d killed her…granddaughter,” said Barry Quinn, assistant state’s attorney.

The 52-year-old allegedly killed Herrera because she would not stop crying, then tried to take her own life by cutting her throat, CNN reported.

A March 10 autopsy report revealed the baby was already dead when her throat was sliced by the power saw.  She died of blunt force injuries to the head, and possibly from suffocation due to a sock being placed in her mouth, according to several news reports.

Rodriguez was charged with first-degree murder following the autopsy.

“I can’t believe this,” Raul Chavez, a neighbor, told WLS.  “I knew them. I knew them real good. I knew them because we would help out each other.”

Rodriguez lived with two of her adult daughters, each having one child, and was viewed as a nice woman by friends and family.

“She would help everybody and if you needed a glass of milk or something she would give it to you,” Maria Gentil, a close friend of Rodriguez, told CBS. “When my mother died, she went up and down the street asking for money for her funeral.”