TODAY   |  May 13, 2013

Boy, 12, arrested in sister’s stabbing death

The small town of Valley Springs, Calif., is reeling after authorities made an arrest in the killing of 8-year-old Leila Fowler: her 12-year-old brother, who previously said a man broke into their house and killed his sister. NBC’s Amna Nawaz reports.

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>>> 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 .