A Brazilian au pair who fell in love with an IRS agent pleaded guilty to manslaughter on Tuesday in what prosecutors say was an elaborate double-murder scheme to frame another man in the stabbing of his wife.

For months after the killings on Feb. 24, 2023, it might have seemed as if Juliana Peres Magalhães and the IRS agent, Brendan Banfield, got away with murders, according to new details prosecutors revealed in court to support her guilty plea.

Christine Banfield, a pediatric intensive care nurse with a 4-year-old daughter, had been mortally wounded with stab wounds to her neck, and Brendan Banfield, her husband, and their live-in nanny both said they shot her apparent killer — a man who had been lured to the bedroom with promises of rough sex.

Magalhães had called 911 to the house in Herndon, Virginia, and was hyperventilating at the scene as she described the killings. Detectives weren’t buying it — but it took time to build their case. Meanwhile, the live-in au pair moved into the primary bedroom with Banfield and posted photos of them as a couple, authorities said. When she was arrested in October 2023, a picture of herself with Brendan Banfield was on the nightstand.

As she remained in jail for more than a year thereafter, she declined to say anything more.

A long-awaited forensics report on the blood spatter evidence then came in, and prosecutors said it showed that Brendan Banfield had smeared blood from Christine Banfield’s wounds onto the body of Joe Ryan, the man they had tried to frame for stabbing her. Authorities arrested Brendan Banfield in September on charges of aggravated murder.

Banfield’s lawyer, John F. Carroll, said in court before he was denied bail in September that the evidence “just doesn’t add up” to him killing his wife.

In October, Magalhães agreed to cooperate with the police in her second interview since the day of the crime. Days later, on Tuesday, two weeks before she was scheduled to go to trial on charges of second-degree murder and felony firearm use, Magalhães pleaded guilty to Ryan’s killing, saying she had agreed to help the husband’s ruse to kill the wife and make it look like they both shot a predator.

“Are you entering your guilty plea because you are in fact guilty of this offense?” Chief Judge Penney Azcarate asked Magalhães before accepting her plea to a single count of manslaughter, reduced from murder and a firearm offense.

“Yes,” she replied, softly.

The sentencing of Magalhães, who was raised in the outskirts of Sao Paulo, now awaits the conclusion of Brendan Banfield’s trial. Depending on her cooperation with authorities, attorneys said in court that they may agree for her to be sentenced to the time she’s already served.

“Much of the information that led to this agreement cannot be made public at this time, due to the upcoming criminal trial against the other defendant in this matter,” Fairfax County Commonwealth’s Attorney Steve Descano said.

A South Korean court found the former police chief of the country’s capital and two other officers not guilty over a botched response to a Halloween crowd crush that killed nearly 160 people in 2022.

The verdict by the Seoul Western District Court drew angry responses from grieving relatives and their advocates, who accused the court of refusing to hold high-level officials accountable for an incident that was largely blamed on a lack of disaster planning and an inadequate emergency response.

Kim Kwang-ho, former chief of the Seoul Metropolitan Police Agency, was the most senior police officer among more than 20 police and government officials indicted over the crush in Itaewon, a popular nightlife district in Seoul. Prosecutors had sought a five-year prison term for Kim.

An investigation led by the National Police Agency found that police and local officials failed to plan effective crowd control measures even though they expected more than 100,000 people to gather for Halloween events in Itaewon.

The investigators found that Seoul police assigned just 137 officers to Itaewon on the day of the crush. Police also ignored hotline calls placed by pedestrians who warned of swelling crowds before the surge turned deadly. Once people began getting crushed in an alley near Hamilton Hotel, police failed to establish control over the site and allow paramedics to reach the injured in time.

Some experts have called the crush a “manmade disaster” that could have been prevented with relatively simple steps like employing more police and public workers to monitor bottleneck points, enforcing one-way walking lanes, and blocking narrow pathways.

The Seoul court acquitted Kim of professional negligence, saying that prosecutors failed to prove that he had violated his duties or to establish a connection between his conduct and the high toll of deaths and injuries. The court also acquitted two lower-ranking police officers who faced similar charges.

The court stated that while Kim received status updates from various departments in his agency and the Yongsan police station about the situation in Itaewon before the crush on Oct. 29, 2022, this information would not have been sufficient for him to recognize the possibility of an incident of such magnitude.

The court also noted that Kim had instructed various police stations in Seoul, including Yongsan, to establish plans to maintain safety during Halloween celebrations.

“Based solely on evidence submitted by prosecutors, it’s insufficient to conclude that the defendants’ professional negligence and its relationship to the occurrence or escalation of this incident are fully established beyond reasonable doubt,” the court said in a statement. Relatives of the victims embraced and cried outside the court after the verdict was announced.

“This court just granted immunity to the police for whenever these kinds of incidents happen again!” one of them shouted. Others scuffled with security as they tried to approach Kim’s car as he left the court.

Itaewon Disaster Bereaved Families, a group representing the victims, said the ruling was “dishonest” and “impossible to understand” and called for prosecutors to appeal.

“We strongly condemn that the main officials of the Seoul Metropolitan Police Agency, who ignored their duties for prevention, preparation and response despite anticipating that a large crowd would develop, and who have been denying their responsibility until now, are being given a free pass,” the group said.

The same court last month sentenced the former chief of Yongsan police station, Lee Im-jae, to three years in prison and convicted two of his colleagues of professional negligence resulting in death, citing their failure to properly prepare for the crowd and respond to the crush.

The court acquitted Park Hee-young, head of the Yongsan ward office, and three other ward officials, saying that they had no legal authority to control or break up crowds.

Lee and another Yongsan police official who received a one-year sentence appealed the ruling earlier this month. The other police official had received a suspended sentence.

The fertile mind of Justice Stephen Breyer has conjured a stream of hypothetical questions through the years that have, in the words of a colleague, “befuddled” lawyers and justices alike.

Breyer, 83, seemed a bit subdued as he sat through the last of more than 2,000 arguments Wednesday in which he has taken part during 28 years on the high court. His wife, Joanna, also was in the courtroom.

But at the end of the case about Oklahoma’s authority to prosecute people accused of crimes on Native American lands, an emotional Chief Justice John Roberts paid tribute to Breyer for his prowess during arguments.

“For 28 years, this has been his arena for remarks profound and moving, questions challenging and insightful, and hypotheticals downright silly,” Roberts said.

A day earlier, Breyer provided only the most recent example, inventing a prison inmate named John the Tigerman in a case involving transporting an inmate for a medical test. Breyer called him “the most dangerous prisoner they have ever discovered.”

Just since Breyer announced in late January that he was retiring, he has asked lawyers to answer questions involving spiders, muskrats and “4-foot-long cigars smoked through hookahs” — none of which, it’s fair to say, had any actual links to the cases at hand.