Police said that it was possible the voice belongs to the man in the photo but also said more than one person could be involved.
On Wednesday morning, police appealed to the public to come forward with any information on the man who was seen on the abandoned train tracks on the Delphi Historic Trails at the same time on February 13 when Williams, 13, and German went missing on a hike.
Indiana State Police Superintendent Doug Carter added: 'Someone knows who this individual is…
And if you're watching, we'll find you.'He also reminded the public that tips could be submitted anonymously.
The two friends were active on social media on their phones before they disappeared, with German posting final Snapchat images of Williams walking on the bridge, which is 60 feet above the creek, at pm. Slocum said: 'We are actively looking for this person.
In the grainy image, the man, can be seen walking with his head down and hands in his pockets, along the same bridge. This person is our suspect.' Authorities believe either the victims came across the killer by chance or the suspect knew their plans and was lying in wait.
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