The son of a Connecticut couple who vanished shortly after losing an appeal over millions in debt has been named a person of interest in their disappearance, according to a source close to the investigation.

Jeffrey Navin, 56, president of J&J Refuse sanitation company in Westport; and his wife, Jeanette Navin, 55, a school library aide in Weston, disappeared Aug. 4, a week after losing an appeal over more than $2 million they owe in debt.

Relatives reported them missing three days later.

State police major crime detectives took over the case on Wednesday and spent the night searching the home at 142 Aldine Avenue in Bridgeport, which police said belongs to the couple's son, Kyle Navin.

A source familiar with the investigation said Kyle Navin, listed online as operations manager of J&J Refuse, is a person of interest in his parents' disappearance. Neighbors said they last saw him about a week ago.

"It's scary," Bridgeport resident Stephen Parisi said. "I live here, and this is 50 feet from my house. I want to know what's going on here."

Although there has been no sign of the missing couple, investigators found their truck on Aug. 9. It was abandoned in a commuter lot near exit 42 off the Merritt Parkway and police said one of the windows was broken.

State court records show that, as of December, Jeffrey Navin was $2.2 million in debt in connection with a mortgage on a $900,000 home in Guilford. Relatives have said there is no indication financial issues factored into the Navins' disappearance.

State police detectives continue to investigate.

NBC Connecticut has sent a request for comment to the email address for Kyle Navin listed on the J&J Refuse website.