"At that age, to have the presence of mind to turn on her video system on her cell phone and record some of the evidence we've obtained, is outstanding on her part", says Slocum.
Indiana State Police played a clip of a man's voice saying "down the hill" during a Wednesday news conference. Tony Slocum said: 'We are actively looking for this person.
Those are the three words, muttered by an unknown man, heard in a video captured by 14-year-old Liberty German's cellphone about the time of her death last week near Delphi.
Bursten said it's possible that even more than one person could be behind the killings, but investigators believe the suspect whose image was released last week at least participated in the double murder.
Revelation: Indiana State Police Superintendent Doug Carter said the voice of the killer was a key clue which he hopes someone would recognize. Previously, the man had been labeled a person of interest and police said he might only be a witness to the crime.
The man was thought to be wearing blue jeans, a blue coat/jacket and a hoodie. Police used a Wednesday press conference to dispel rumors that the photo had been taken from a trail camera. "This young lady is a hero".
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Greg Massa, assistant special agent in charge of the FBI's Indianapolis field office, asked residents of Delphi and nearby communities to go back to February 13 in hopes of identifying anyone who did anything unusual that day, including someone who canceled an appointment, called out sick from work or backed out of a social engagement - even with a plausible excuse. Liberty German's decision to make a recording provided police with their best information.
Williams and German had gone missing Monday, Feb. 13, near the Monon High Bridge near Delphi after failing to meet with family members at a pick up spot after they had spent a few hours walking on trails.
Last week, police released a photo of the man they wanted to speak with, and they're now calling him the main suspect in the girls' murders. They were supposed to be picked up later in the afternoon, police said, but failed to show up.
"We talked all the time [about safety], it was something that I stressed, but I guess not enough", Patty said.
The next day, the girls' bodies were found in a wooded area near the Delphi Historic Trail, about one-half mile upstream from the bridge.
The 24-hour tip line is 844 -459-5786.