Police are withholding numerous details surrounding the case, as they continue to investigate, but they announced startling new evidence on Wednesday that was captured moments before the girls were killed.
"This young lady's a hero, there's no doubt about it", Indiana State Police Public Information Officer Sgt. The audio recording comes from a phone belonging to one of the victims, 14-year-old Liberty German.
"But, we're looking for the tip that gives us a suspect and/or suspects that we can hold accountable for the murder of Liberty German and Abigail Williams".
Photos of the man police want to speak with. Investigators revealed they have other video and evidence that was recovered from her phone as well. The digital billboards include photos of the slain teens as well as one of the prime suspect in the case. Police have not released the girls' cause of death.
Police have released only a still image from the video and a loop of the words "Down the hill" in repetition. Police haven't said if the voice recording is of the same man.
The FBI has been assisting local authorities in the double homicide probe since last week.
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"To have enough presence of mind to activate that video system on her cellphone, to record what we believe is criminal behavior that's about to occur", Slocum said.
Phone calls to the dedicated tip line will now be answered at the Federal Bureau of Investigation's Major Case Contact Center in Washington, D.C., state police announced Thursday afternoon. Why Carroll County? Why the region, the state, the nation?
"Every time it rings we wonder if that's going to be the call", she said.
There are apparently more clues within the footage, however police are choosing to keep these private at this stage in order to "preserve the integrity of the investigation", says the NY Post.
"Someone knows who this individual is", Indiana State Police Superintendent Douglas Carter said.
The FBI is offering $41,000 as a reward for information that may help solve the case, according to WXIN.