Third person charged in murder of Humble mom who was brutally stabbed in her own home

Rebecca Keller, 20, is charged with murder and sexual assault of a child.

October 30, 2012 1:53:25 PM PDT
A third person is now charged in the murder of a mother who was brutally stabbed in her own home.

Mary Ann Murphy, 48, was found dead in her Humble home back in July. Her own 16-year-old daughter and a second person, Zein Ahmed, were already charged in Murphy's murder. Now, Ahmed's girlfriend, 20-year-old Rebecca Keller, has also been charged.

Keller told investigators Murphy's daughter asked her to help kill her mother.

Keller is also charged with sexual assault for having a relationship with the daughter.

She is in Harris County Jail on bonds totaling $80,000.