Prosecutors now allege Aubrey Trail and Bailey Boswell began conspiring to commit murder more than four months before they met Sydney Loofe, according to court documents.
The allegation arose in a court filing Friday afternoon in the prosecution of Trail, who is accused of strangling the 24-year-old Loofe in Wilber on Nov. 15, 2017.
Assistant Nebraska Attorney General Sandra Allen filed a conspiracy to commit murder charge in Trail's case and alleged he and Boswell began plotting July 1 to kill someone.
In their conspiracy, Boswell "solicited" young women on social-networking sites, Allen said in the filing.
Together, they selected Loofe as their victim and bought tools to kill and dismember her, the amended information said.
Boswell and Loofe connected on the dating app Tinder, where Boswell used the name "Audrey," according to investigators.
Loofe's family reported her missing Nov. 16, the morning after she went on a date with Boswell and then failed to report to work at the north Lincoln Menards.
Her body was found Dec. 4 in rural Clay County.
Prosecutors charged longtime persons of interest Trail and Boswell in June 2018 and alleged they were recorded on surveillance cameras at the north Lincoln Home Depot buying unspecified supplies used in Loofe's killing and dismemberment hours before Boswell's date with Loofe, according to court documents.
No motive for killing Loofe has been made public.
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But a court hearing requested by prosecutors may reveal evidence the state believes would show Trail's motive.
Trail has told investigators and reporters Loofe died at his hands in an accident, and that there were other people in the room when she died.
Trail has said that the items purchased at Home Depot on Nov. 15 were needed for his antiques business and for Thanksgiving.
Trail's attorney, Ben Murray, said the new charge wasn't unexpected but didn't have further comment Friday.
In addition to the conspiracy to commit first-degree murder charge, Trail faces counts of first-degree murder and improper disposal of human remains.
He will be arraigned on the new charge later this month. Trail is set to stand trial in June.
Boswell is charged with first-degree murder and improper disposal of human remains. No additional charges had been filed against her as of late Friday afternoon.
Her case hasn't been set for trial.
Boswell's attorney, Todd Lancaster of the Nebraska Commission on Public Advocacy, declined to comment on the state's newest allegation.
In both cases, the state is seeking the death penalty.
Trail was being held Friday at the Lincoln Correctional Center, while Boswell remained at the Saline County jail in Wilber.