Heather Mack killed mother Sheila von Wiese at St. Regis Bali resort in 2014
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U.S. prosecutors in Chicago are seeking 28 years in prison and maximum fines for a woman who brutally killed her mother at a luxury resort in Bali a decade ago and served time there before pleading guilty to federal charges in Illinois.
Heather Mack, 28, pleaded guilty to a federal charge of conspiracy to kill a United States national in June for her mother's slaying in 2014.
An Indonesian court found her guilty of holding Sheila von Wiese's mouth shut as her boyfriend at the time, Tommy Schaefer, beat her to death.
The pair then stuffed her body into a bloody suitcase at the St. Regis hotel and left it in a taxi.
AMERICAN WOMAN ACCUSED OF KILLING MOTHER ON BALI VACATION, HIDING BODY IN SUITCASE PLEADS GUILTY
Heather Mack of Chicago is mobbed by reporters as she arrives in court for her sentencing hearing at a district court in Denpasar, Bali, Indonesia, April 21, 2015. (AP Photo/Firdia Lisnawati, File)
"The murder of von Wiese at the hands of the defendant and Schaefer was vicious," federal prosecutors wrote in a sentencing memo earlier this week. "The evidence indicates von Wiese struggled to stay alive, meaning that, in the last moments of her life, she realized that her daughter, and only child, was responsible for her death.
"Von Wiese had been worried that Mack would one day kill her, and it is hard to fathom the physical and emotional pain von Wiese endured in the final moments of her life."
Mack's lawyers are seeking a sentence of 15 years maximum with time served credit for her Indonesian incarceration, arguing it would be "unwarranted" to keep her in prison longer after co-conspirator Robert Bibbs received a nine-year sentence for helping to plot the murder.
The body of Sheila von Wiese Mack was found Aug. 12, 2014, stuffed into a suitcase in the boot of a taxi in front of the five-star St. Regis hotel. (Sonny Tumbelaka/AFP via Getty Images)
Schaefer, Bibbs' cousin, is also accused of taking part in the murder in an effort to get "rich" off the money they thought they would have inherited from von Wiese.
Prosecutors recovered text messages between Mack and Schaefer in which they coordinated the murder and fantasized about how to spend the money.
Tommy Schaefer, left, and his girlfriend, Heather Mack, arrive at a court in Denpasar on the Indonesian holiday island of Bali Feb. 2, 2015. (REUTERS/Antara Foto/Nyoman Budhiana )
"I can't wait to be rich," Schaefer wrote days before the murder. "I seriously can't wait…I'm like thinking of lavish lifestyles."
"Lmao," Mack replied.
Read the government sentencing memorandum for Heather Mack
A moment before the murder, Mack again texted Schaefer, telling him to "[g]ive her a minute to be off guard" before beating her to death with a metal handle in her hotel room, according to court filings.
An autopsy found defensive wounds on von Wiese's body and determined she died of blunt force trauma that fractured her nose and jaw and obstructed her airway.
FBI ARRESTS 'SUITCASE KILLER' HEATHER MACK AT CHICAGO AIRPORT AFTER RETURN FROM BALI
A police officer escorts suspect Heather Mack, 19, center, during an investigation at a police office in Nusa Dua on the Indonesian resort island of Bali Aug. 13, 2014, after an American tourist's battered body was found in a suitcase at an exclusive hotel on Indonesia's resort island of Bali. (Sonny Tumbelaka /AFP via Getty Images)
The couple then hid the bloody sheets and replaced them with a clean set, stuffed von Wiese into a suitcase and threw it in the trunk of a taxi outside the hotel lobby, according to prosecutors.
When the taxi driver refused their fare, they left the suitcase in the trunk and went to a different hotel, where they checked in under fake names. Indonesian police arrested them the next morning.
A police officer escorts suspect Tommy Schaefer, 21, right, during an investigation at a police office in Nusa Dua on the Indonesian resort island of Bali Aug. 13, 2014. (Sonny Tumbelaka/AFP via Getty Images)
Mack was released after serving seven years of her 10-year Indonesian sentence and deported to the U.S., where police arrested her as soon as she arrived. Schaefer is still in prison overseas.
Michael Ruiz is a reporter for Fox News Digital. Story tips can be sent to
