...But the underwater image has prompted skepticism from one forensic pathologist, who says it's probably not a skeleton.

Underwater snapshot prompts authorities to send dive team to investigate. "I do not believe that these photos represent a body. I think it's a rock formation that certainly does present upon initial perception a suggestion of a human skeletal remains, but I do not believe that it is," Dr. Cyril Wecht said.

After looking at the photograph that first appeared in the Intelligencer Journal/Lancaster New Era newspaper, Wecht, one of the country's leading forensic pathologists, said the image doesn't match what a skeleton should look like.

"If you look at what would have to be the head you see that it does not really fit. It it's a front view, then what would be orbital sockets are far too low. If it's a rear view, then that does not fit because there's a lower portion that would not fit in with the neck," Wecht said.

Wecht said it's not likely that the skeleton of the missing teen could remain intact for that long.

"The whole idea of a skeletal remains being in the water for a period of a couple of months shy of five years is just untenable," Wecht said.