A pregnant Chicago teen who was killed and whose baby was cut from her womb was strangled while being shown a photo album of the late son and brother of her attackers, a prosecutor said Friday in urging a judge to keep the defendants locked up.

Assistant State's Attorney James Murphy told Cook County Judge Susana Ortiz that 19-year-old Marlen Ochoa-Lopez managed to get her fingers under the cord around her neck and that the woman strangling her, Clarisa Figueroa, then yelled at her daughter, "You're not doing your f*****g job!"

The daughter, 24-year-old Desiree Figueroa, then pried Ochoa-Lopez's fingers from the cord while her mother continued to strangle the teen, Murphy said.

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.

This combination of booking photos provided by the Chicago Police Department on Thursday, May 16, 2019 shows from left, Pioter Bobak, 40; Clarisa Figueroa, 46; and Desiree Figueroa, 24. Charges against them come three weeks after 19-year-old Marlen Ochoa-Lopez disappeared and a day after her body was discovered in a garbage can in the backyard of Clarissa Figueroa's home in Chicago's Southwest Side. (Photo: AP)

The mother's lawyer asked Ortiz to place the Figueroas in protective custody for their safety, given "the nature of the case."

Clarisa Figueroa, 46, apparently wanted to raise another child a year after her adult son died of natural causes, investigators said.

"Words cannot express how disgusting and thoroughly disturbing these allegations are," Police Superintendent Eddie Johnson told reporters at a news conference to announce the charges. They came three weeks after the disappearance of Ochoa-Lopez, whose body was discovered this week in a garbage can in the backyard of Figueroa's home on the city's Southwest Side, about 4 miles from Ochoa-Lopez's own home.

According to police, the young woman drove from her high school to Figueroa's home in response to an offer of free clothes that Figueroa had posted on Facebook. When she arrived, police said, she was strangled and the baby cut from her body.

A few hours later, Clarisa Figueroa frantically called 911, claiming that her newborn baby was not breathing. When first responders arrived, the child was blue. They tried to resuscitate the infant and transported the boy to a nearby hospital, where police said he remained in grave condition and was not expected to survive.

Police did not connect the woman's disappearance and the 911 call about the baby until May 7, when friends of Ochoa-Lopez directed detectives to her social media account, which showed she had communicated with Clarisa Figueroa in a Facebook group for expectant mothers.

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, said Brendan Deenihan, deputy chief of detectives.

"She told an extremely odd story," and officers "kind of knew where this is headed," Deenihan said.

Police then searched the neighborhood and found Ochoa-Lopez's car a few blocks away. On Tuesday they returned with a search warrant, finding cleaning supplies as well as evidence of blood in the hallway and in the bathroom. They later found the body in a trash can behind the house and recovered surveillance video that showed Ochoa-Lopez's vehicle driving through the neighborhood on the day they believed she was killed, authorities said.

Ochoa-Lopez's family had been looking for her since her disappearance on April 23, organizing search parties and holding news conferences as they pushed police for updates in the investigation.

Her father, Arnulfo Ochoa, said relatives were grateful to have found her. Now they want justice. The family was also bracing for the baby's death, while still hoping for a miracle.

"We plead to God that he gives us our child because that is a blessing that my wife left for us," Yiovanni Lopez told reporters through a Spanish interpreter outside the county morgue where his wife's body was taken.

The three suspects were scheduled to appear Friday in bond court.