The incident happened shortly after 4 a.m. Monday in a home on Sunrise Terrace in Cedar Grove.
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The 86-year-old victim was found in a second floor bedroom. She had been stabbed about 15 times, according to police.
She was transported to an area trauma center in critical condition.
Responding officers found the suspect, 60-year-old Tanya Spears of Cumming, Georgia, in a first floor bedroom. She was taken into custody.
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Spears faces multiple charges, including attempted murder and aggravated assault. She was taken to the Essex County Jail to await a bail hearing.
Police say the motive for the attack is not yet known as the investigation continues.
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