The body of a missing mom who was nine months pregnant was found strangled to death Wednesday in a Chicago home, and her baby was cut out of her womb after she was killed, PEOPLE confirms.

Marlen Ochoa-Lopez, 19, who also went by the last name Ochoa-Uriostegui, had been missing since April 23, police say.

On that day, authorities responded to a 911 call from a 46-year-old woman saying that her baby was not breathing. That baby boy, a Chicago police spokeswoman tells PEOPLE, was actually Ochoa-Lopez’s.

Three people are in custody and charges are pending, the spokeswoman says.

Fox 32 reports that family members say the baby, named Yavani Yadiel Lopez, is on life support at the hospital and has no brain function, while the police spokeswoman describes the baby’s condition as “grave.”