Girl, 14, Killed Half-Sister, 11, After Stabbing Her 40 Times; Town's Mayor Asks for Prayers for the Grieving Family

A 14-year-old girl fatally stabbed her younger half-sister 40 times in a gruesome incident that has shaken the quiet suburban Chicago-area community of Mundelein.

Police said the victim was 11-years-old but are not releasing names at this time. Police were called to the home Tuesday morning and initially told by the suspect that a man had broken into the house and killed the victim. Soon after once the sister was questioned she admitted to killing the victim and explained that she killed her because she felt unappreciated.

The teen was charged with first-degree murder in juvenile court after she allegedly stabbed the younger girl while she was still sleeping in her bed in Mundelein around 8:30 a.m. Tuesday.

"It's quite a tragedy," Mundelein Mayor Steve Lentz told the Chicago Tribune at press conference. "Please pray for us, first all for the family…there's a lot of grief going on right now."

The alleged killer woke up Tuesday, went downstairs got a knife and returned to her half-sister's room, where she repeatedly stabbed the girl because "she didn't appreciate the things she had been doing around the house," according to WMAQ.

"This incident is a heartbreaking tragedy that defies understanding," said Lentz. "I am asking the Chicagoland area, please pray for us. Pray, first of all, for the family that has been devastated by this."

The younger sister was found with stab wounds on her neck, arms and chest, police revealed. The girl is also said to have had defensive wounds on her hands and bruises on her arms and chest.

"There were signs of a struggle," Mundelein Police Chief Eric Guenther told the Chicago Tribune.

Neighbors revealed that the girls lived at the home with their mother and said the two sister seemed close.

"They would always be together," Mary Ann Gryder, a neighbor told WLS. "The older one would be taking care of the younger one, and vice versa."