Eric Matthew Frein, 31, is still on the run, but a sighting of the fugitive, who stands 6 feet 1 inch tall and weighs 165 pounds, may help lead authorities to him. A woman told police she may have seen Frein close to the eastern Pennsylvania town of Swiftwater Friday night, CNN reported. She described him as a man armed with a rifle and his face covered in mud.

Investigators believe the man was Frein, who is suspected of the Sept. 12 shootings of Pennsylvania State Police Cpl. Byron Dickson and Trooper Alex T. Douglass outside the police barracks in Blooming Grove. Dickson was killed, and Douglass was wounded. Police are continuing to search the Paradise Township area for the suspect.

Police have described Frein as a “self-taught survivalist” with a grudge against law enforcement. The manhunt for him grew from 200 officers Sept. 17 to nearly 1,000 Sept. 24. Law-enforcement personnel from New York, New Jersey and elsewhere in Pennsylvania have joined the search, which also includes participants from the Bureau of Alcohol, Tobacco, Firearms and Explosives; FBI; and U.S. Marshals Service.

Police believe they have seen Frein several times, but the rugged terrain of the area has allowed the suspect to escape.

“Some of the sightings have occurred in circumstances where he kept himself far enough away where he knew that it was unlikely someone could get to him,” Pennsylvania State Police Lt. Col. George Bivens told ABC News in September. “I almost think this is a game to him.”