As far as we know from what has been released by a collaborated effort from the local and state police, with guidance from the FBI, the picture of the guy on the bridge is the only suspect. That would lead me to think the voice capture released by this collaborative effort is likely that of the only suspect identified. While no one has come forward to identify him, I would say it it likely the image and voice are the one, lone suspect. I am stymied with the reward so high, no one has come forward to name him successfully.
Why could that be? Is he so off the radar that no one knows him? Is he so technically ignorant to not know what a cell phone with these capabilities could do?
Trying to put it all together and understand why he would not see the importance of a teen girl's phone and what evidence it could provide versus how he has not been identified. All I can think tonight is he must be completely off the grid.