Nearly five days after a man opened fire on the Beltway, killing a father of four, Prince George’s County Police said detectives are closing in on a conclusion to the case.

The fatal shooting happened on the outer loop just after 11:30 p.m. on Saturday, as thousands of drivers took to I-495 for holiday travel.

“We do have some information that's leading us towards a resolution,” said Prince George's County Police Chief Hank Stawinski at a news conference Thursday. “I don't want to be cryptic, but when I can speak about it plainly, you know I will speak about it frankly.”

RELATED: Wife: Beltway shooting death may have been road rage

Sources within the department say the case will likely turn out to be a matter of escalated road rage – with a man pulling the trigger from another car on the roadway. Adriano Lombre, 55, was fatally wounded, driving home to Upper Marlboro from the District.

Lombre’s wife and daughter are still worried that the killer is behind the wheel with a gun.

“They're still out there to hurt someone else,” Lombre’s wife Tracey said in an interview. “My husband is gone. He didn't hurt nobody.”

RELATED: Police seek witnesses after man found dead in car on I-495

Authorities have not yet released a suspect or vehicle description, but said they have received helpful information through traffic cameras and license plate readers.

Prince George’s County Police also encouraged members of the public to call (866) 411-TIPS if they noticed any strange events or behavior that could be connected to the shooting near the Pennsylvania Avenue exit.