SAN FRANCISCO (KRON) -- The San Francisco district attorney has decided to file charges against the mother of Nicholas Faibish, the 12-year old San Francisco boy killed in a dog mauling attack.

Maureen Faibish has been charged with felony child endangerment with an enhancement of felony child endangerment that resulted in death.

"There is clear evidence that the defendant knew her child faced serious danger when she left the home," said District Attorney Kamala Harris. "Based upon the facts, we are compelled to charge this case."

Faibish reportedly locked her son in the basement while she went out to run errands on June 3, in order to keep him away from their family pit bulls Ella and Rex. The female dog, Ella, was in heat, and Faibish told the San Francisco Chronicle she believes Nicholas got out of the basement and interrupted the dogs as they were mating.

Harris says Faibish's decision to lock her son in the basement was one that "endangered his life and ultimately led to his death" and called the attack "completely preventable."

Faibish was served with an arrest warrant Thursday and remains in custody on $75,000 bail. She will be arraigned early next week.

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