Tommy Schaefer will face charges stemming from the notorious killing of his former girlfriend's mother in Bali back in 2014.
Police said he and Heather Mack killed Mack's mother so Heather could get money from a trust fund.
RELATED: Heather Mack update: Oak Park native sentenced to 26 years in connection with mother's Bali murder
Mack spent time in an Indonesian prison and is already serving time here.
Schaefer was sentenced to 18 years in prison. He was deported back to the United States from Bali International Airport on Tuesday evening, after serving his sentence and receiving a number of remissions for good behavior, said Felucia Sengky Ratna, head of the Bali Regional Office of the Directorate General of Immigration, in a statement.
The Associated Press contributed to this report.