State police have returned again to a landfill in Putnam amid the search for a missing Easton couple who disappeared in early August.
Investigators have been searching the Putnam Ash Residue Landfill, a 186-acre site used to dump ash from all the state's waste-to-energy plants, in connection with the case of Jeffrey and Jeanette Navin.
The couple vanished from their Easton home on Aug. 4, shortly after moving from Westport, according to state police. Jeffrey Navin serves as president of the J&J Refuse waste management company in Westport, while Jeanette works as a school library aide in Weston.
Sources familiar with the investigation have told NBC Connecticut the couple's son, Kyle Navin, 27, has been named a person of interest in his parents' disappearance.
He was arrested on a federal gun charge earlier in the week, and a family member believes Kyle Navin was the last person to see his parents, according to the affidavit.
Kyle Navin works as operations manager of J&J Refuse and told police the family was in the process of selling the company, according to police reports obtained by NBC Connecticut.
Investigators searched the landfill a couple weeks ago. State police have not found any human remains and said in a prior news release the "Putnam Ash Residue Landfill was searched in an effort to rule it out as a possible location."
Search warrants reveal that no phone calls have been made from the couple's cellphones since the day they disappeared. Those phones have since been turned off.
Five days after the couple vanished, a state trooper found the couple's pickup with a broken window in a Westport commuter lot. Investigators have taken more than a dozen swab samples from the vehicle, according to the warrants.
Police have also searched the couple's current and former homes and one of their bank accounts.
A judge denied Jeffrey Navin's motion to reopen a case appealing more than $2.2 million in debt on a $900,000 Guilford home about a week before he and his wife went missing. Other relatives have said they don't believe the couple's finances played a part in their disappearance.
State police ask anyone with information to call 860-685-8190. All calls will remain confidential.