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Sick, newly released drawings by BTK serial killer Dennis Rader show a series of terrified bound and gagged women — and cops think they may have identified at least one of them as a known missing woman.

The disturbing images were released as part of a major new drive to examine possible cold cases tied to the ailing 78-year-old who dubbed himself BTK for “bind, torture, kill.”

Two of the sketches show women — including one in a short red dress or blouse — bound with nooses hung around their necks.

The third shows a blonde-haired woman staring with clear fear in her eyes, with her arms and legs bound in rope and a red gag in her mouth.

That woman, wearing a green top, is thought to have been identified as a southeast Kansas woman who vanished in 1991, Osage County Sheriff Eddie Virden told CNN.

While Virden would not disclose additional details about her identity, he told the outlet his team had “very, very good tips” regarding the drawing and potential victims.

“It’s going to be a busy week,” Virden said of the flow of tips that have “provided more information.”

Rader was sentenced to life in prison in 2005 for a series of 10 grisly murders that terrorized Wichita, Kansas for over two decades.

The newly released drawings were among hundreds secreted away in the suburban dad of two’s possessions at the time of his arrest, CNN explained.

The three images were released in the hopes someone might recognize the scenes, thought to be in barns or silos, Verdin said.

“We’re hoping that releasing these, someone might recognize one of these barns or the unique features in them, or the closeness of the silo to the barn or possibly might have even found items that they didn’t know why were there that could be very important in this case,” Virden told CNN.

The three images were released in the hopes someone might recognize the scenes, thought to be in barns or silos, Verdin said.

“Even if the barn’s not there anymore. We would still like that information.”

In the image of the woman in the green shirt, officials believe the black piping behind her may be an important clue.

“The reason you would have that is if you were moving livestock through there, that those bars would keep the livestock from hitting probably the tin or the wood on the outside of the barn so that if an animal hit it, you know, they wouldn’t go through and dent up the tin or knock the wood off the outside,” Virden told CNN.

“We know from things Dennis said on this exact photograph that it was a drawing he created from an actual barn,” he added.

The woman in the red shirt, Verdin continued, appears to be a wooden space like a tack or feed room.

“That would be a barn that had wood slats. You know, possibly a rounded post but in that area of the barn what would have possibly a wooden floor, you know and a lot of times in tack rooms inside of barns or in feed rooms or storage. They wouldn’t leave a dirt floor because they didn’t have livestock in that area,” Virden explained.

The third drawing, he noted, features a peculiar angle on the staircase that could help identify the actual location.