CHICAGO (AP) — Federal prosecutors have filed conspiracy charges against the cousin of a man convicted in the slaying of a Chicago woman at an Indonesian resort.

Prosecutors say 24-year-old Robert Bibbs of Chicago advised his cousin Tommy Schaefer and Schaefer’s girlfriend, Heather Mack, on how to kill Mack’s mother, Sheila von Wiese-Mack.

Von Wiese-Mack’s body was found stuffed inside a suitcase in a taxi at a resort in Bali in August 2014. Nineteen-year-old Heather Mack and the 21-year-old Schaefer were convicted in her killing.

Prosecutors contend Bibbs knew of the plot to kill von Wiese-Mack before Schaefer and Mack carried it out. He allegedly advised them on how to kill the victim and counseled Schaefer on how to evade detection by police.

Authorities say Bibbs was arrested Wednesday.

Bibbs believed Schaefer would get access to the estate of Von Wiese and share the proceeds with family, the Chicago Sun-Times reported.

Both Mack and Schaefer were convicted in connection with the murder in Bali earlier this year.

Schaefer allegedly told Bibbs in a text message on July 25, 2014, that Von Wiese’s murder would happen within a month, according to court documents cited by the Sun-Times.

After Schaefer had arrived in Bali, he sent a text to Bibbs, saying that an attempt to kill Mack’s mother by a overdose had failed.

Schaefer’s text read: “Wasn’t enough bro . . . ” He used an emoji of a handgun and wrote, “Definitely need that.”

At one point while they were in Bali, Mack was urging Schaefer to go in and kill her sleeping mother.

Schaefer then sent a series of text messages to Bibbs, stating, “She wants me to right now”… “while she snoozing”

“Go in,” Bibbs allegedly replied. “Go sit on her face wit a pillow then.”

(TM and © Copyright 2015 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)