The latest case out of Chicago - in which 19-year-old Marlen Ochoa-Lopez was strangled and her baby cut from her womb - has similarities to numerous roughly 30 similar crimes carried out over the last three decades across the United States, an expert said.
Marlen Ochoa-Lopez, 19, was found strangled behind a house where she is alleged to have been lured to collect free baby clothes on 23 April.
Police say the suspects include Piotr Bobak, who's been charged with concealing a death of a person, his girlfriend Clarisa Figueroa and her daughter Desiree Figueroa are both facing first-degree murder charges. Her boyfriend, 40-year-old Piotr Bobak, was charged with concealment of a homicide.
The day Ochoa-Lopez disappeared, the Chicago Fire Department got a call about a newborn in distress at the same address where the woman's body was later found.
The nine-months-pregnant woman went to the Figueroa's home expecting to gather some baby clothes and other donated items, police said.
The Figueroas allegedly lured the pregnant teen to their home in late April under the guise of giving her free baby clothes. Her daughter had extra baby clothes that had never been worn, she claimed, explaining, "She was lucky to have two baby showers so she just loves to spread the wealth".
In 2017 the mother's 27-year-old son died from natural causes, police said.
On May 7, Chicago police received a break in the investigation and learned Ochoa was in communication with Figueroa, according to police.
"[Desiree Figueroa] confesses that she assisted her mother - strangling Marlen", Deenihan said. At 19, she was married, finishing up at Latino Youth High School and expecting her second child.
The baby, given the name Yadiel Yovany Lopez by the family, is on life support and has no brain function, family members said.
Ochoa-Lopez vanished last month after she went to get baby items from a woman she met on a Facebook group, Cecelia Garcia, a spokeswoman for the victim's family, told CNN affiliate WGN. The baby isn't breathing.
Ochoa-Lopez's body was discovered more than three weeks later in the back of the Southwest Side home, according to police. That almost full-term baby survived, but the mother, Debra Evans, and two of her other children were killed.
Suspicious, detectives subpoenaed hospital records and began to collect DNA samples from the baby, his biological father and Figueroa.
That day detectives also went to the hospital to interview Clarisa Figueroa, who denied Ochoa came to her house but admitted knowing her.
Tere Layra, a family friend, remembers Ochoa-Lopez spent hours doing her homework and would scoff at doing household chores instead of studying. On Tuesday, they returned with a search warrant, finding cleaning supplies as well as evidence of blood in the hallway and the bathroom.
The pregnant woman, who had been reported missing three weeks ago, has been identified as Marlen Ochoa-Uriostegui.
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