Police need your help in finding a woman missing in the Prairie du Chien area since last year's holiday season.

Shannon Fischer’s parents reported her missing December 28, 2006. Now at least three detectives are working on what is now believed to be a murder investigation.

"At this point we're absolutely operating on the theory this is a homicide. She did keep in reasonably close contact with friends and family, she was seen at all times," says Prairie du Chien police chief Michael King.

That was until December 18, 2006.

King says around the time of her disappearance, Shannon Fischer had been staying with her then boyfriend in the city's downtown, when they had a falling out.

"He did indicate that at some point he did, I believe his exact words were "she's annoying and I got rid of her," which is a poor choice of words, which obviously made him an immediate person of interest."

Detectives followed up on that lead, along with investigators from the Division of Criminal Investigation and the FBI.

"At this point they've been interviewed, re-interviewed, re-re-interviewed and our detectives don't feel that anybody is a specific person of interest right now."

One year after her disappearance, missing person signs still hang in the windows of downtown shops in Prairie du Chien. Police say what makes this case so difficult to solve is that Shannon Fischer didn't have a permanent address, a job, credit cards or a cell phone.

"A lot of the things we would normally use to track a person just don't exist in this case, so it's a “who dunnit”, no one knows," says King.

Another difficulty is lack of any hard evidence.

"We have no crime scene. We have no physical evidence. We have no body, no circumstantial evidence, so we'll take any lead we can get right now."

Including leads from a psychic, Shannon Fischer’s family is working closely with.

"We did have a psychic indicate that she may be buried in a local quarry. We brought in cadaver dogs. We searched that, we searched other specific locations that some have identified that might be involved."

Leads that turned up nothing.

Because no one close to Shannon is an immediate suspect and the nature of her lifestyle, police are operating on the theory Shannon Fischer was the target of a random murder.

"We haven't given up. We're hoping someone will see that billboard and go "oh by golly, I do remember that person," says King

Shannon Fischer’s parents are in weekly contact with Prairie du Chien detectives and are preparing for the worst.

If you have any information on her disappearance or whereabouts, contact Prairie du Chien police.