Clarisa Figueroa then called 911, claiming that she had just delivered her own newborn baby and that it was not breathing, authorities said. When first responders arrived, the child was blue. They tried to resuscitate the infant and transported Clarisa Figueroa and the boy to a nearby hospital.

When she went to the hospital, doctors who examined her found “no signs consistent with a woman who had just delivered a baby.” She also had blood on her arms, hands and face that authorities later determined was from Ochoa-Lopez, prosecutors said.

It was not clear whether the hospital contacted police. In a statement issued Friday, Christ Medical Center in suburban Oak Lawn declined to comment, citing federal and state regulations. Oak Lawn police said they were not contacted about Figueroa by the medical center or any other agency, including the Chicago Police Department.

The boy remained hospitalized Friday in grave condition and was not expected to survive, police said.

Cook County Judge Susana Ortiz denied bond to the Figueroas, who are charged with murder, saying she felt “the presumption is great” that they committed a “heinous and brutal murder” and that they pose “a real and present” danger to the community. She also denied bond to Clarisa Figueroa’s boyfriend, 40-year-old Piotr Bobak, who is charged with the concealment of a homicide.

The mother’s lawyer asked Ortiz to place the Figueroas in protective custody for their safety from other inmates, given “the nature of the case.” The Figueroas stood calmly during the hearing. As they left, the mother glanced back at the crowded gallery, where the victim’s friends and relatives packed the spectator benches.

The arrests came three weeks after the disappearance of Ochoa-Lopez, whose decaying body was discovered this week with the cord still around her neck.

Police did not connect Ochoa-Lopez’s disappearance and the 911 call about the baby until May 7, when friends of the teen directed detectives to her social media account, which showed she had communicated with Clarisa Figueroa.

At the same time, Clarisa Figueroa had started a GoFundMe campaign for the funeral of what she said was her dying baby, said Sara Walker, a spokeswoman for Ochoa-Lopez’s family. Police then conducted DNA tests, which showed that Ochoa-Lopez and her husband, Yiovanni Lopez, were actually his parents, Walker said.

When police arrived to question Clarisa Figueroa, her daughter told them that her mother was in the hospital with some kind of leg injury, before adding that she had just delivered a baby, Brendan Deenihan, deputy chief of detectives, said Thursday.

Police then searched the neighborhood and found Ochoa-Lopez’s car a few blocks away. On Tuesday they returned with a search warrant.

Ochoa-Lopez’s mother, Raquel Uriostegui, said her daughter was born in Mexico and came to the United States when she was 2.

“My daughter was a very joyful girl. She had a lot of dreams,” Uriostegui said.

“She wanted to do great things, like all of us,” added her husband, Yiovanni Lopez.

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Associated Press writer Sara Burnett and videojournalist Noreen Nasir contributed to this report.