I hope this will clarify for some:
"The description of the person of interest emerged after surveillance videos showed a man following Graham early Saturday morning. The man told police that he was following Graham because she appeared "physically distressed" and he was trying to help her.
The man also told police that he stopped following Graham when he she met a second man that she seemed to know and put his arm around her, according to police.
[snip]
The new videos show Graham, 18, walking past an outdoor mall area at 1:06 a.m. and a man in light colored shorts following her. At one point he ducked into a corner and watched her.
A second camera shows the same man following Graham a few minutes later, according to police.
The man called into the police tip line hours before the surveillance footage that showed him following Graham was released. He went to the police station at 10:15 p.m. Wednesday night.
"Anyone who saw her is a person of interest," Capt. Gary Pleasants told ABC News. "He saw her and said he was following her, so that's interesting. But right now we're seeing him as a cooperative witness."
[snip]
"He told police that he was following Ms. Graham as she looked to be somewhat physically distressed and he wanted to make sure she got safely to wherever she was going," police said in a statement.
Investigators are searching for the second man who the witness alleges spoke to Graham and stopped her as she was walking.
The second man is not seen in any of the surveillance footage."
http://abcnews.go.com/US/missing-university-virginia-student-hannah-graham-man/story?id=25592387