Police say they want to contact the man regarding what he might have seen.
Search parties scowered the area Monday afternoon and Tuesday morning, and the search ended early Tuesday afternoon when the two bodies were found about three-quarters of a mile from where the girls were last seen, police said.
The bodies of the two teens were found Tuesday in a wooded area about 50 feet from the banks of Deer Creek, 60 miles northwest of Indianapolis.
The girls were identified on Wednesday, but authorities are not yet releasing the cause or manner of their deaths.
Carroll County Sheriff Tobe Leazenby said authorities do not yet have a suspect or suspects in the girls' deaths.
People within the Delphi community are hopeful a photograph released by state police will lead to justice being served in the case of two murdered Carroll County teens.
As of Tuesday, authorities had not called off the search, but according to Sergeant Kim Riley with Indiana State Police during a Tuesday press conference, the search had been "scaled back", RTV6 reported.
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Families of the girls have been studying the last photo of Abigail, in which she is seen walking across a creepy abandoned railroad bridge in Deer Creek.
Police and search parties scoured the base of the bridge and surrounding trails for hours before calling the search off due to darkness.
They also say Williams was wearing a gray zip up sweatshirt with a burgundy t-shirt underneath and blue jeans.
They were dropped off near the Monon High Bridge Trail but never returned to be picked up.
The Delphi Community Schools Corporation sent students home with a letter saying the bodies found were two of their missing middle school students. Callers can remain anonymous if they wish. "Parents should make sure they know where their children are and what their children are doing, and if nothing else, know what's going on in their lives".
"I found myself to the point of tears because of the fear", Levy said. They go to church together, they have community events'.