Still, the voice of the suspected killer continues to haunt the local community.
In an audio clip released by Indiana State Police, the killer can be heard telling the girls to go down the hill.
Investigators said Libby recorded the suspect s voice and snapped a photo on her cell phone before her young life was taken away.
While the suspect remains on the run, investigators, like Carroll County Sheriff Tobe Leazenby, are still searching for answers. It has been four years, but for us, it seems like it was just yesterday when we started this thing, Sheriff Leazenby said.
The bodies of Libby, 14, and Abby, 13, were found after they went missing on February 13, 2017, while hiking at Delphi Historic Trails in Indiana. Their killer remains on the run.