FALL RIVER (CBS) – A 15-year-old is charged with murder after a woman was stabbed multiple times inside a Fall River apartment Sunday night. Heavenly Arroyo was held without bail after being arraigned in court Monday.

It happened around 5 p.m. on Johnson Street. Ana Vazquez, 68, was found with serious injuries inside a second floor apartment. Vazquez was rushed to Charlton Memorial Hospital but was pronounced dead.

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Arroyo was formally charged with murder and held without bail following arraignment in a closed session in Fall River District Court Monday. Prosecutors say the girl will be tried as an adult.

“I think you got to remember, she’s a 15-year-old,” said John Geary, Arroyo’s defense attorney. “She knows she was in court. I don’t believe she knew the seriousness of what was happening.”

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According to a police report, Arroyo told a detective “I killed the old lady, and I’m sorry.” She allegedly stabbed Vazquez with a knife up to 20 times, prosecutors said.

Police also said that security cameras show Arroyo putting a knife and her own bloody clothes in a dumpster.

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It’s believed that Arroyo was living in Fall River for the past two weeks and is from Rochester, New York, the Bristol County District Attorney’s Office said.