PLAINFIELD, Ill. (CBS/WBBM) – As the fourth anniversary of the disappearance of Plainfield mom Lisa Stebic arrives, a police sergeant calls the investigation “stagnant.”

As WBBM Newsradio 780′s Steve Miller reports, a much-ballyhooed development announced on the third anniversary has gone nowhere.

LISTEN: Newsradio 780′s Steve Miller reports

Last year, three years after Stebic’s disappearance, it was announced that the Will/Grundy Major Crimes Task Force would join the investigation.

“They did look into it,” said Plainfield Detective Sgt. Kevin McQuaid. “They are no longer looking into it anymore.”

McQuaid said too few tips are coming in and he called the investigation “stagnant.”

“We really haven’t had anything new come up in the last, probably, six months to a year,” McQuaid said.

Last year, Lisa Stebic’s cousin, Melanie Greenberg, said she was hopeful that a new Plainfield police chief might be a fresh set of eyes on the case.

But that chief has stepped down for health reasons, and now there is an interim chief.

“Tumult in that department doesn’t really help us right now,” Greenberg said.

This year, for the first time, Greenberg says the family is not planning a public prayer vigil for the anniversary because it’s just too difficult.

Stebic was 37 when she disappeared on April 30, 2007. Her husband, Craig Stebic, said she had gone to work out and never returned.

Lisa Stebic’s family, like the authorities, believe she was the victim of foul play.

“I talked to Lisa’s parents,” McQuaid said. “They kind of feel like Lisa’s case is in a drawer gathering dust.”

Craig Stebic was named a person of interest in his wife’s disappearance, and remains classified as such. At the time of the disappearance, divorce proceedings were pending against Craig Stebic.

Craig Stebic remains a person of interest in the disappearance of his wife, Lisa Stebic. (2007 File Photo; Credit: CBS)

A $75,000 reward has been on the table for information in the case.