(WXIA) -- The FBI is offering a reward of up to $20,000 for any information about a missing Putnam County woman.

Just after noon Tuesday, Georgia Department of Natural Resources rangers launched a specially equipped pontoon boat brought in from Lake Lanier to search a portion of Lake Oconee for 87-year-old Shirley Dermond.

She's been missing for exactly one week since the decapitated body of her husband, Russell, 88, was found in the garage of their nearby lakefront home.

A man wanted in Twiggs County for impersonating a peace officer was arrested in Kentucky on Tuesday.

Twiggs County Sheriff Darren Mitchum said Mark Tucker, 53, was picked up by Nicholasville, Ky. police on charges that also include criminal damage of property, burglary and possession of a firearm during a crime.

Tucker, who lives in Kentucky, was spotted by a resident on Fourth Street in Danville on Sept. 9 with a woman.

The resident asked what they were doing and Tucker told him he was with the sheriff's office and opened his shirt exposing a gun and badge, Mitchum said.

Tucker told the resident he was trying to recover a stolen dalmatian and to not tell his neighbor they were at the house, a Twiggs County incident report stated.

The resident told his neighbor who called the sheriff's office.

Glass on the front door was shattered to gain entry to the house. Dresser drawers were open, but nothing was missing, the report stated.

Twiggs County deputies search for two men who fled the scene of a routine traffic stop today.  

Around 12:30 p.m., they stopped a car with four passengers, two men and two women, on I-16 west for a window tint violation. 

A second unit arrived to the scene, and the two men in the car fled the scene.  Deputies used the dogs, and the Georgia State Patrol chopper to search for the men, but have not found them.

The car contained loose leaf marijuana and open containers of alcohol.  Deputies search for Charlie Branner, 36, from Vidalia and Michael Laquell Sanders, 33, also from Vidalia, also known as Kool-Aid and Smokie.

They both will face charges of felony obstruction and possession of a firearm by a convicted felon when they are caught.