A 65-year-old Maryland man who went missing last week in the extreme cold might have been picked up by a driver along Route 1 in Prince George's County.

Daniel DeHaven, who has dementia and is nonverbal, went missing last week while on a shopping trip at a Costco.

In a Twitter message, police said Sunday that DeHaven might have been picked up Jan. 2 while he was walking on Route 1 by a driver who dropped him off in the 800 block of Annapolis Road in Gambrills.

The public is asked to be on the lookout for DeHaven.

Prince George's County Deputy Chief Sammy Patel said the department has been working with police in Anne Arundel and Howard counties to expand the search for DeHaven after receiving the latest tip.

The man who picked up and dropped off DeHaven thought he was homeless or someone who couldn't speak English or who who needed to get to a shelter, Patel said.

Prince George’s County police are searching for 65-year-old Daniel DeHaven, who wandered away from a Costco on Baltimore Avenue in Beltsville about noon Jan. 2. Police worry that DeHaven, who suffers from dementia and is nonverbal, could be anywhere in the freezing cold. (Prince George’s County Police/Prince George’s County Police)

DeHaven was picked up around Savage, Md., and pointed the driver to an area where he eventually was dropped off at Arundel High School, according to officials.

Police plan to return to the area in force Tuesday afternoon for another extensive search after sending helicopters over the area during the weekend.

"This hasn't slowed down," Patel said. "We're hoping we'll have a positive outcome."

When DeHaven was missing last week, officials launched helicopters, bloodhounds and dozens of police officers to search for him.

He was last seen about 11:30 a.m. Jan. 2 at the Costco on Baltimore Avenue in Beltsville, according to Prince George's police.

DeHaven's son, Kevin, had said his father is a kind man who is open to new people. He said his father is probably confused.

"He's out there somewhere probably cold and probably hungry, but he is nice and approachable," Kevin DeHaven said.

The D.C. region has faced harsh cold throughout the past week. Authorities have reminded family members to keep a close watch on elderly relatives who may require extra help.

In this cold snap, a 79-year-old woman was found in dire condition in freezing temperatures in Fairfax County. She suffers from dementia.

DeHaven is described as a white man, 5 feet 9 inches tall and weighing about 175 pounds. He was last seen wearing a long black coat.

Anyone with information is asked to call 301-699-2601.