An infant boy who was cut from his mother's womb with a butcher's knife several weeks ago has died in hospital.
Yovanny Jadiel Lopez had been in a grave condition since the April attack in Chicago that killed 19-year-old Marlen Ochoa-Lopez.
The baby died from a severe brain injury at Christ Medical Centre in Oak Lawn, according to a statement by family spokeswoman Julie Contreras.
"Please keep his family in your thoughts and prayers as they go through this difficult time," Ms Contreras said.
Another family spokeswoman, Cecilia Garcia, also confirmed the baby's death on Facebook.
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He had been on life support since being brought to the hospital on 23 April.
Prosecutors say Clarisa Figueroa, 46, claimed she had given birth to the child.
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She and her 24-year-old daughter, Desiree Figueroa, are charged with murder over the death of Marlen Ochoa-Lopez.
Chicago police spokesman Anthony Guglielmi said he expects both women will now be charged with murder in connection with the infant's death.
Cook County State's Attorney's Office told Sky News it will make a determination on additional charges in the case after the medical examiner's office and the police department have completed their investigations.
Clarisa Figueroa's boyfriend, Piotr Bobak, is charged with concealing a homicide. The three defendants are due back in court on 26 June.
A spokesperson for Christ Medical Centre told Sky News: "Our hearts and prayers continue to be with the Ochoa-Lopez family, whose courage and grace have drawn the admiration of our entire organisation."
Authorities allege that not long after Clarisa Figueroa's adult son died of natural causes, she told her family she was pregnant.
They say she plotted for months to acquire a newborn, and that she posted an ultrasound and photos of a room decorated for a baby on her Facebook page.
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