CHICAGO — A mother and her daughter have been charged in the killing of a 19-year-old pregnant woman who was strangled before her baby boy was cut from her womb.

At a news conference Thursday, Chicago police officials said detectives found coaxial cable used to strangle Marlen Ochoa-Lopez in the same garbage can in which her body was found in the family’s backyard.

Clarisa Figueroa, 46, and her daughter, Desiree, 24, were both charged with first-degree murder.

The older Figueroa’s boyfriend, Piotr Bobak, 40, was charged with concealment of a homicide.

Police said the younger Figueroa confessed to assisting her mother in strangling Ochoa-Lopez.

Police Superintendent Eddie Johnson said the elder Figueroa had lost a son in his 20s in 2017 when he died of natural causes.

Ochoa-Lopez went missing on April 23 after leaving Latino Youth High School in Chicago’s Little Village neighborhood. Nine months pregnant, she drove to a home on the southwest side where the elder Figueroa, whom she met on Facebook, was offering a double stroller and baby clothes. Once inside the home in the 4100 block of West 77th Place, police said Ochoa-Lopez was killed and the baby removed.

The newborn had problems breathing and Figueroa, who police say lured Ochoa-Lopez into the home, made a frantic 911 call saying the baby was “pale and blue,” officials said. The baby was rushed to a hospital, where the teen’s family said the boy was brain-dead but still hooked up to life support.

Ochoa-Lopez’s body was dumped in a garbage can behind the home, where it was discovered early Wednesday, hours after the suspects were taken into custody, police said.

Cook County court records show Bobak has had several run-ins with law enforcement. He has no felony convictions but has two for misdemeanors: One of them is on a sex act-related public indecency charge in which he was sentenced in 2009 to six months of court supervision, the records show. He was also convicted of battery in 2012 and sentenced to two years of court supervision and community service in the Cook County Sheriff’s Department’s Work Alternative Program.

Figueroa was once charged with two misdemeanors, one for battery in 1998 and another for marijuana possession in 2008, records show. Both cases were dropped.

Ochoa-Lopez’s 20-year-old husband vowed justice as he stood outside the Cook County medical examiner’s office, where his wife’s body was taken. “Why did these people, why did these bad people do this? She did nothing to them,” said Yovani Lopez, stretching his arm in back of him, toward the morgue Wednesday night. “She was a good person.

“We’re going to have justice with those responsible,” he added. “We’re going to go hard after them. We won’t let it go.”

Following is a timeline of the case, pieced together from police, fire officials, the medical examiner’s office, the family and neighbors from the home where Ochoa-Lopez was found.

— In the days before she disappeared, Ochoa-Lopez visited an online Facebook group for mothers, looking for a stroller and baby clothes for her son, due to be born in less than a month. She came into contact with a woman, allegedly Figueroa, who told her “my girl has all brand new boy clothes her son never wore,” according to a screenshot provided by Ochoa-Lopez’s family.

“Yes girl thats fine thank you so much,” Ochoa-Lopez responded.

“No problem girl,” the woman replied. “I know how it is she was lucky to have two baby showers so she just loves to spread the wealth I’m fine with the help inbox me for more info ok.”

— After classes on April 23, Ochoa-Lopez drove from her high school in Pilsen to a one-story brick home in the Scottsdale neighborhood, about nine miles away.

— Around 6 p.m. that day, the Chicago Fire Department answered a 911 call from the home reporting that a child had just been born. When paramedics arrived, they saw “the baby was in obvious distress,” according to department spokesman Larry Langford. A source said the baby “was basically blue.”

The paramedics started advanced life support and radioed for another ambulance. The baby was taken in critical condition to Advocate Christ Medical Center in Oak Lawn.

Some paramedics stayed on the scene with the woman they believed to be the mother. Paramedics asked the woman if she had any cramps, bleeding or dizziness and she said no. She was taken to the same hospital as a precaution.

Paramedics do not typically conduct physical examinations after childbirth, Langford said. At the time, there was nothing suspicious that raised alarms. The hospital would not comment on the case.

— Police and the family say the baby was placed in the intensive care unit, where he remained Thursday. The family has said the boy has no brain function, apparently from lack of oxygen. In the following days, the residents of the home on 77th Place apparently set up a GoFundMe page for the baby, according to screenshots provided by Ochoa-Lopez’s family.

Figueroa is listed as organizing the fundraising drive, which sought $9,000. The page featured the picture of a small baby hooked up to a breathing tube and monitors. It has since been taken down.

— On May 8, more than two weeks after the ambulance call, Ochoa-Lopez’s black Honda Civic was found abandoned in the 7700 block of South Keeler Avenue, not far from where her body would be discovered. Neighbors on the block said they had seen the car around the neighborhood and noticed several parking tickets on it.

— In recent days, Ochoa-Lopez’s family said it has been told by police that DNA samples from the baby were a match with DNA extracted from the teen’s toothbrush and hairbrush. The family has been visiting the baby at the hospital, and the father has named the boy Yovani Yadiel Lopez.

— On Tuesday afternoon, police officers were seen escorting four people from the home on 77th Place, two women and two men.

— About 12:10 a.m. Wednesday, the medical examiner’s office was notified of a body at the 77th Place address. Police said it was found behind the home but it was not known exactly when it was dumped there.

— 5 p.m. Wednesday. Community members gathered at Lincoln United Methodist Church to pray for Ochoa-Lopez and her family. “My heart is bleeding,” Jacobita Cortes, a pastor at the church, said in Spanish.

Cortes said the community has no other recourse but to pray and hope. “In Marlen’s case, we take it like if it was happening to our own family,” she said in Spanish. “We have looked for her and prayed for her. It is so difficult.”

— About an hour later, around 6:15 p.m. Wednesday, the medical examiner’s office identified the body as Ochoa-Lopez and said she was strangled and that her death was a homicide.

Chicago Tribune’s Elyssa Cherney contributed to this report.