Eyewitness News has confirmed Delphi investigators have arrived in Colorado to interview Daniel Nations.

COLORADO SPRINGS, Colo. (WTHR) - Eyewitness News has confirmed Delphi investigators have arrived in Colorado to interview Daniel Nations.

Nations is sitting in a Colorado jail. Soon, he could be in even more trouble.

He is already facing charges for menacing and a felon in possession of a weapon. Prosecutors could file new charges against him at any time. Sources are tight-lipped on what those charges will be.

Nations is a "person of interest" in the murders of Libby German and Abby Williams. Indiana State Police investigators are in Colorado, wanting to interview Nations.

It appears as if he is at the top of the list of potential suspects and investigators want to know more about Nations' whereabouts in February.

Eyewitness News has confirmed Nations checked in with the Morgan County Sheriff's Department on February 7th and 14th as part of his responsibilities as a registered sex offender. The bodies of the Delphi girls were discovered on February 14. He claimed to live in Morgan County at the time, but since he didn't have a permanent address, he had to check in once a week. The sheriff's department didn't know what time he checked in on the 14th.

In Indianapolis, Eyewitness News found a woman who spoke to Nations just days after the Delphi murders. We learned that at the time Nations was homeless and in and out of work.

Roxie Bortner and her family were friends with Nations for over a year.

"We seen him coming up the sidewalk, we said, here comes 'Depressing Daniel'," she said.

But they considered him a close friend. "He always had a sad story, always talking about how terrible his life was."

Bortner said they had no idea Nations' life included so many crimes. The 31-year-old accumulated arrests and convictions for drugs, alcohol, assault, domestic violence, indecent exposure and other crimes.

He is a registered sex offender in at least three states.

"He was pretty much living under the overpass, sleeping in my son's car. He never really had a place stay," Bortner said.

Until the family found him one.

Was he ever scary or violent? "No, not while he was in my house," she answered.

Delphi teenagers Abigail Williams and Liberty German disappeared February 13. The murdered bodies of the best friends were found the next day. Bortner remembers seeing Nations right after the murders.

"He come over talking depressed. His wife wasn't talking to him and everything," she explained.

But she said Nation's behavior wasn't unusual.

"No, he was acting just like he always acts," she said.

A month later, Bortner says Nations broke into her home and they parted ways.

The number one question for detectives is likely where was Nations the day of the murders. If he talks, they will go to work trying to confirm any alibi, using witnesses, cell phone records, charge card purchases and security camera videos. That may be very difficult. It's been nearly eight months since the deaths of the teenagers and memories fade.