Aubrey Trail claimed responsibility for the death of Lincoln woman Sydney Loofe and challenged the FBI to file charges against him and his girlfriend during separate calls with reporters on Wednesday.

“I am responsible, and I am accountable," Trail told the Journal Star.

The 51-year-old denied that Bailey Boswell, his 23-year-old girlfriend, had anything to do with Loofe's death, as he has in his public statements since their arrests Nov. 29.

Neither Boswell nor Trail have been charged in connection with Loofe's death or disappearance. An FBI investigation is on-going.

Loofe, a 24-year-old Menards cashier, went on a date with Boswell Nov. 15 and was last seen in Wilber at Trail and Boswell's apartment.

Her family reported her missing the next day after she didn't show up for work.

Loofe's remains were found off a country road southeast of Clay Center in south central Nebraska Dec. 4. Authorities said they found evidence of foul play there, but an FBI spokesman said Wednesday the bureau is only conducting a death investigation so far. No cause or manner of death has been publicly released.

Trail's comment to the Journal Star was vague, and he has not publicly confessed to killing Loofe or provided any detail on what happened. Later Wednesday, he told the Omaha World-Herald that he is "accountable for Sydney Loofe's death."

Since being named a person of interest, Trail has made a variety of public statements about the extent of his involvement in Loofe's disappearance and death.

Boswell has not spoken publicly since her arrest and did not respond to a letter the Journal Star sent her seeking comment in December.

Now being held at a maximum-security federal prison in Leavenworth, Kansas, Trail placed a series of calls to the Journal Star on Wednesday and promised "fireworks" at his next court appearance, which is now scheduled for Thursday afternoon. He and Boswell face federal charges related to an alleged fraud scheme.

In one call to the newspaper, he implored the FBI to file charges against him and Boswell because investigators have more than enough evidence against them.

"If they want justice for Sydney, somebody charge us,” said Trail, who stopped short of directly claiming responsibility for her death on that call.

Trail first spoke publicly about Loofe in Facebook videos posted online in late November shortly after Lincoln police named him and Boswell as persons of interest in her disappearance.

In that video, Trail denied their involvement though Boswell admitted she brought Loofe back to the Wilber apartment where they smoked marijuana.

The pair in that video said they dropped Loofe off at her friend's home in Lincoln, but investigators said they weren't able to corroborate that claim.

Trail in a Dec. 22 interview with the Journal Star declined to provide a more detailed timeline of events in the case beyond the moment when Loofe came to his Wilber apartment.

"That's where all the questions are going to come up in court," he said.

He wouldn't address what he did Nov. 16, the day Loofe was reported missing, but told a Journal Star reporter in a jailhouse interview that he, Boswell and an acquaintance of theirs went to a casino in Council Bluffs Nov. 17.

"I know for a fact, and I can prove that Bailey Boswell was not present when Sydney Loofe was killed," Trail said Dec. 22.

FBI spokesman Huston Pullen said Wednesday that Trail and Boswell are still considered just persons of interest in the case. He declined to respond to Trail's statements.

During Wednesday's call, Trail asked why there hadn't been more news stories about the Loofe case.

He also gave conflicting statements about the investigation and his involvement.

He claimed he told investigators that Loofe's cellphone was found along a roadside, and that he proved to them he could "deliver." Still, he insisted that having information and committing a crime are different.

Moments later, he made his vague comment about being "responsible" and "accountable" in the case, but when pressed to specify, he moved on.

"(Investigators) don't know where it happened. They don't know why it happened," Trail said on the call. "Let's make Wilber famous for more than just Czech Fest."