A pregnant woman who had gone to a Chicago home in response to a Facebook offer of free baby clothes was strangled and her baby cut from her womb.

The newborn was in grave condition and not expected to survive, and three people were taken into custody, including a woman who pretended the baby was hers, police said.

The body of 19-year-old Marlen Ochoa-Lopez was found early on Wednesday local time behind the house, more than three weeks after she disappeared, reports wgn tv.

The nine-months-pregnant woman was last seen leaving her high school on April 23, the same day paramedics were called to the home several kilometres away on the Southwest Side about a newborn with problems breathing.

“We believe that she was murdered, and we believe that the baby was forcibly removed following that murder,” police spokesman Anthony Guglielmi said, calling it an “unspeakable act of violence.”

Chicago Fire Department spokesman Larry Merritt said a 46-year-old woman called 911, reporting her newborn baby was in distress. When paramedics arrived “the baby wasn’t breathing, the baby was blue”, said Mr Merritt. Paramedics tried to resuscitate the baby on the way to the hospital, he said.

The family of Ms Ochoa-Lopez, a married mother of a three-year-old son, said a woman on Facebook had lured her to the home by offering a stroller and baby clothes. “She was giving clothes away, supposedly under the pretence that her daughters had been given clothes, and they had all these extra boy clothes,” said Cecelia Garcia, a spokeswoman for the family.

Ms Ochoa-Lopez’s family has been looking for her since her disappearance, organising search parties, holding news conferences and pushing police for updates on the investigation.

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. The GoFundMe campaign said the baby was about to die and money was needed for a funeral, Sara Walker said.

Police then conducted DNA tests to determine if Ms Ochoa-Lopez and her husband, Yiovanni Lopez, were his parents.

“Even though we found her without a life, at least we’re grateful that we found her. And we want justice — that’s what we want,” Ms Ochoa-Lopez’s father, Arnulfo Ochoa, said as he stood with other relatives outside the county’s medical examiner’s office, where his daughter’s body was taken.

Mr Lopez told reporters he understood his son was likely to die soon, but he still wasn’t giving up hope.

“We plead to God that he gives us our child because that is a blessing that my wife left for us,” he said in Spanish through an interpreter.

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