News 12 is providing new information about the case of Edgemont native Lauren Spierer as the 13th anniversary of her disappearance approaches next week.

Spierer was last seen walking barefoot toward her Bloomington, Indiana apartment on June 3, 2011.

"Thirteen years later, a lot of the rabbit holes were debunked," says Shawn Cohen.

Cohen was a local reporter when the 20-year-old college sophomore vanished - and spent years investigating her disappearance.

He has a new book out called "College Girl, Missing," which took six years to create and contains evidence he says has never been publicly shared.

"What's new is I gained access to the private investigator files, which includes interviews with dozens of witnesses. I went from there and followed up with those individuals and identified some new witnesses," he says.

One of those witnesses is fellow Indiana University student Corey Rossman, who was one of the last people to see Spierer the night she vanished.

"In my interview with him, doubled down on his memory loss. He said he couldn't remember anything from that night and additionally, he couldn't remember anything from the next day," he says.

Cohen also describes a minute-by-minute recap of Spierer's last hours on campus and details what he referred to as a botched investigation.

"What I learned from the private investigator files... and then reaching out to the individuals who were interviewed, is that a lot of them hadn't even heard from police, or if they had, they weren't interviewed in any serious manner," he says.

Cohen says he is letting the facts speak for themselves.

"There is no evidence that she made it out of that townhouse alive," he says.