Girl stabs sister 40 times

 An 11-year-old Illinois girl was stabbed 40 times by her 14-year-old sister, police say, and
the reason why has many in the small Chicago-
area community of Mundelein reeling in disbelief. Police found the 11-year-old girl unconscious and
in need of medical attention in an upstairs
bedroom of the Illinois suburb Tuesday morning.
She later died. Because the sister, who called police, initially told
officers an intruder was to blame for the attack,
authorities briefly placed three schools on
lockdown. The truth, when it emerged, was even more
shocking. The 14-year-old, authorities say, repeatedly and
fatally stabbed the victim -- her half sister -- with a
kitchen knife because the teen thought she was
ungrateful. "This incident is a heartbreaking tragedy that
defies understanding," said Mundelein Mayor
Steve Lentz. "I am asking the Chicagoland area,
please pray for us. Pray, first of all, for the family
that has been devastated by this." Intruder in the house Police received a 911 call about the incident at
8:30 a.m Tuesday. The call came from the 14-
year-old girl, said Mundelein Police Chief Eric
Guenther. The teen told emergency dispatchers that an
intruder had barged into the home, attacked her
sister and then fled, CNN affiliate WLS reported. Schools in area were immediately placed on
lockdown, Guenther said. "The area-wide school lockdown lasted only 15
minutes," he said. But the teen's story unraveled quickly. Under
police questioning, she admitted to the attack,
authorities said. Feeling unappreciated The teen told police she was mad that her sister
didn't appreciate all she did for her, prosecutors
said at the suspect's detention hearing
Wednesday. WLS was at the hearing. The teen said she cooked dinner for her younger
sibling and performed other chores. She was also
angry that the 11-year-old girl had recently hit her. The night before the attack, the teen thought
about it for about 10 or 15 minutes, then went
downstairs and grabbed a knife, according to
prosecutors. After the stabbing, she took a shower to wash off
the blood, called police and made up the story
about the intruder, prosecutors said. The 14-year-old was arrested and was charged
with murder. The case is in juvenile court and a decision could
be made in the future to move the case to adult
court, the Lake County State Attorney's Office
said. Playing together Those who knew the girls said they lived at the
home with their mother. Neighbors said the
siblings seemed close. The girls were often seen playing together and
practicing cheerleading routines, WLS reported. "They would always be together," Mary Ann
Gryder, a neighbor told the affiliate. "The older one would be taking care of the
younger one, and vice versa."