TODAY | May 13, 2013
>>> stabbing of an 8-year-old girl in california. ana navaz has the story.
>> reporter: a small town remains in shock.
>> the very core of our life is shaken.
>> reporter: after authorities announced an astonishing arrest in the killing of 8-year-old leila fowler.
>> at 5:00 p.m . detectives arrested leila 's 12-year-old brother at the valley spring substation and on charges of homicide.
>> reporter: leila was found stabbed multiple times in her home two weeks ago her 12-year-old brother the only witness. his initial statement a man broke in and killed his sister launched a massive manhunt across this rural tight knit community. friends and families rallied at a vigil last week.
>> i want to thank the community and all of our family and friends for the overwhelming amount of support you've given my family.
>> reporter: they have not yet commented on the arrest of one of their sons, as anguish as turned to disbelief that leila 's own brother could have committed the crime.
>> i didn't want to believe it. you kind of thought so but it's not something you want to believe.
>> reporter: and a family bearing the burden of one devastating blow now struggles to deal with another. ana navaz, nbc news, los angeles .