Heather Mack has already spent nearly every day behind bars since her mother’s bludgeoned body was found stuffed in a suitcase in the Bali resort where they’d been vacationing nine years ago, sparking international headlines and leading police on a trail that began in suburban Chicago.

On Friday, Mack will undoubtedly be facing many years more in prison, as she is set to plead guilty in the federal murder conspiracy case against her in Chicago rather than go to trial in August.

Mack, 27, is scheduled to enter her guilty plea during an in-person hearing before U.S. District Judge Matthew Kennelly at the Dirksen U.S. Courthouse.

The terms of any plea deal she has struck with prosecutors have not yet been released. It’s not surprising, however, that Mack’s case would be resolved without a trial considering the breadth of the evidence against her and the fact that the charge carries a potential life sentence.

Mack was convicted in Indonesia in 2015 of helping her boyfriend with the murder and served about seven years in prison, only to be arrested by the FBI when she landed at O’Hare International Airport in 2021 on a federal indictment that had been filed under seal while she was still overseas.

The indictment charged her with conspiracy to commit murder in a foreign country and obstruction of justice in the killing of her mother, whose bludgeoned body was found stuffed into a suitcase outside the St. Regis resort in August 2014, sparking months of international headlines.

[ The Bali ‘suitcase murder’: Oak Park native Heather Mack’s murder conviction, Indonesian imprisonment, deportation ]

Also charged with the same counts was her boyfriend at the time of the murder, Tommy Schaefer, who is still in prison in Bali.

The allegations in von Wiese-Mack’s horrific slaying are well known by now. Authorities alleged Mack conspired with Schaefer to kill her mother in order to gain access to a $1.5 million trust fund set up after her father’s death. Mack was sentenced to 10 years in prison in Indonesia for the crime, but was released early for good behavior.

She has been held without bond at the Metropolitan Correctional Center since she was arrested by the FBI in November 2021 as she left the Delta Air Lines flight at O’Hare’s Terminal 5.

Schaefer, who admitted to fatally beating von Wiese-Mack, was sentenced to 18 years and remains behind bars overseas.

Federal prosecutors in Chicago had previously charged Schaefer’s cousin, Robert Bibbs, with helping in the murder plot. The FBI learned of Bibbs’ involvement after analyzing text messages found on Schaefer’s phone.

Bibbs, 32, is serving a nine-year prison sentence in Michigan for coaching the defendants on how to carry out the murder in return for a share of the anticipated multimillion-dollar estate. He is eligible for parole in 2025.

Mack’s daughter, now 7, has been placed with a relative in the U.S. after a lengthy and bitter custody battle in Cook County Circuit Court.

At a bond hearing for Mack in 2022, Bill Wiese, Mack’s uncle, said Mack continues to be a danger to anyone who crosses her, saying in a statement to the court that as recently as 2019, she threatened the life of a journalist who’d told her he thought she was being untruthful in a jailhouse interview.

“Heather said, and I quote, ‘You trust me not to come after you with a big pineapple knife or a fruit bowl when I get out on parole?’ ” Wiese said.

Weise and his sister, Debbi Curran, also decried the sensationalism and profiteering that has continued in the years since their sister’s murder, but said they had to come to court to communicate the truth about Mack.

“Facing Heather at the hearing was one of the necessary steps for justice and healing for our entire family,” Weise said in the lobby of the Dirksen U.S. Courthouse.

Prosecutors, however, argued in a motion to deny bond that Mack has a history of violent and erratic behavior brought on by mental health issues. They also detailed the brutality of von Wiese-Mack’s slaying, including how Schaefer allegedly struck the victim with a heavy fruit bowl in their hotel room while Mack covered her mother’s mouth with her hand.

In a recorded phone call, with Schaefer’s cousin, Mack explained that she covered her mother’s mouth to make sure she died, “because Schaefer would have been in even bigger trouble if (von Wiese-Mack) survived,” prosecutors wrote.

“These and other admissions indicate that Mack didn’t just conspire to kill her mother, but was directly involved in her mother’s murder,” prosecutors wrote in the motion.

In arguing for detention, Assistant U.S. Attorney Ann Marie Ursini said prosecutors were prepared to play a four-minute video from the hotel that allegedly depicted Mack and her boyfriend as they tried to get the bloody suitcase with her mother’s body into a cab. After the driver became suspicious, Mack and Schaefer fled and checked into another hotel using fake names but were quickly arrested.

Kennelly, however, said he didn’t need to see the video because there is no real dispute about what happened.

jmeisner@chicagotribune.com