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PLYMOUTH TOWNSHIP, Mich. — A 15-year-old suburban Detroit girl accused of stabbing her younger brother as part of a plot to kill her family so that she could run off with a 23-year-old man was ordered held on $1 million bond Thursday.

The girl, who is facing adult charges of assault with intent to murder and conspiracy to commit murder in last Friday’s attack, wore a red jail jumpsuit at her hearing, which her parents attended.

Michael Rivera, who prosecutors and the girl’s parents describe as her boyfriend, was ordered held on $1 million bond Sunday. He faces the same charges as the girl, plus a felonious assault charge.


Prosecutors say the girl stabbed her brother in the throat and tried to stab her younger sister. The boy was treated at a hospital. Prosecutors contend that during the attack, Rivera was outside the girl’s Plymouth Township home sending text messages instructing her.

‘‘He was using her to do his dirty work. She was under this man’s spell,’’ the girl’s mother told reporters.

The girl’s parents said she and Rivera were in a sexual relationship. The Associated Press isn’t naming the girl or her family members because prosecutors said they may file sex charges against Rivera, since the girl is a minor.

The parents said the girl met Rivera earlier this year through social media.

Associated Press