Homicide

Prosecutors: Michigan girl wanted to kill her family so she could run off with adult boyfriend

This photo released by the Plymouth Township Police Department, shows Michael Rivera. 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 Rivera was ordered held on $1 million bond Thursday, Oct. 23, 2014. 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. (AP Photo/Plymouth Township Police Department) (AP Photo/Plymouth Township Police Department)

This photo released by the Plymouth Township Police Department, shows Michael Rivera. 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 Rivera was ordered held on $1 million bond Thursday, Oct. 23, 2014. 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. (AP Photo/Plymouth Township Police Department) (AP Photo/Plymouth Township Police Department)  (The Associated Press)

Prosecutors say a 15-year-old Michigan girl stabbed her 12-year-old brother and conspired to kill other family members so she could run away with her 23-year-old boyfriend.

Wayne County prosecutors said Wednesday girl is charged as an adult with assault with intent to murder and conspiracy to commit murder. Her boyfriend faces the same charges and felonious assault. He was ordered held on $1 million bond Sunday.

Prosecutors say the girl stabbed her brother in the throat with a knife about 2 a.m. last Friday and tried to stab her younger sister. The boy was treated at a hospital. Prosecutors say the boyfriend was outside the girl's Plymouth Township house sending text messages instructing her.

She's due in court later Thursday. The Associated Press sent her lawyer a message seeking comment.