Three people were charged Thursday - including a mother and her daughter - in connection to the savage murder of 19-year-old Marlen Ochoa-Lopez, who had her baby ripped out of her womb after being strangled to death.
Police said that her baby was cut out of Ochoa-Uriostegui's body after she was killed.
Deenihan said detectives visited the Figueroa home last week after learning of the Facebook contact between the two women.
The case has similarities to numerous roughly 30 similar crimes carried out over the last three decades across the USA, an expert said.
A break in the investigation came after the woman who said she had given birth to the baby set up an online fundraising campaign, another spokeswoman for Ochoa-Lopez's family said.
Police have not identified who they believe carried out the act but have taken four people considered persons of interest into custody.
"Only they know that", Johnson said.
The dark-haired 19-year-old vanished April 23 after she made an appeal to mothers on a Facebook group called Help a Sister Out. Her mother's boyfriend, Piotr Bobak, 40, faces a charge of concealment of a homicide. Authorities haven't said a body of an infant has been found.
The teen's family said they've been told by police that the baby was on life support at Advocate Christ Medical Center in Oak Lawn with no brain function.
The woman said she was located near West 79th Street and South Pulaski Road, an intersection just blocks from the house where Ochoa-Lopez's body would later be found.
The baby is in the hospital in critical condition. "She was a very resourceful person, obviously, she was negotiating things for her birth, her newborn baby". They are demanding justice for Marlen and her loved ones.
Chicago Fire Department spokesman Larry Merritt said a woman called 911 reporting that her newborn baby was in distress.
On May 14, detectives executed a search warrant and found bleach and cleaning solutions in the home and brought the people living there in for interviews.
Her family said the teen was last heard from as she was headed to a stranger's home to pick up unwanted baby clothing and a stroller. They also matched the baby's DNA to the father, she said.
Figueroa and her daughter Desiree Figueroa, 24, both were charged with one felony count each of first-degree murder and one felony count of aggravated battery of a child Under 13, according to a police news release obtained by PEOPLE. A 46-year-old woman told her "my girl has all brand new boy clothes her son never wore", according to a screenshot provided by her family. She said that correlates to a time in which hospitals boosted their security, significantly decreasing the number of newborns stolen from maternity wards or neo-natal units.
Chicago police superintendent Eddie Johnson said at a press conference "let's look at what the crime was" when asked for a motive.