PIEDMONT, Okla. - Anne Hill, 16, was last seen April 10th.
The Piedmont teen was an honors student at Casady School in Oklahoma City.
Her car was discovered days later in Edmond with all her personal belongings inside, but so far, there have been no signs of her.
But four months later, volunteers are not slowing down in their search efforts to find her.
Just last Thursday, an organized group of about thirty people went door to door in an Edmond neighborhood near Boulevard and Danforth.
"We just heard some information that she might have been out here and so we run with it," said Darcie Parton-Scoon with the Center for Search and Investigations. "We will tear this town up one brick at a time until we find out what we need to find out."
Parton-Scoon says the volunteers went door to door passing out flyers and gathering information.
"Have you seen this girl? Have you seen this car? Do you know anybody here that knows her?" said Parton-Scoon.
The non-profit, all volunteer organization has conducted several searches to find information on Hill's whereabouts, including searches with human remain dogs.
"Part of the process with the grid searches and the flyer handouts is that we eventually will develop enough information that we decide we want a dog to go through there," said Parton-Scoon. "With Anne, we need people to know that something happened here."
Parton-Scoon believes some rural Edmond landowner may have found something they don't even realize could be related to the case.
"There is someone who saw something or found something that they don't know is, the possibility is high that they don't know is related," she said. "We don't leave anything unturned. So whatever that takes, is what we're going to do."
Parton-Scoon says they have several leads to follow up on after Thursday's search.
An anonymous donor is offering a ten thousand dollar cash reward for information in this case.
If you know something, you're asked to call Oklahoma City police.