Serial killer BTK says prison cell searched amid cold-case probes; denies involvement

Dennis Rader, the serial killer known as BTK, says cold-case investigators recently interviewed him

EXCLUSIVE: Dennis Rader, better known as the serial killer BTK, says prison guards tossed his cell and seized his belongings during a recent meeting with cold-case investigators.

Rader, who will spend the rest of his life behind bars, has been under investigation in Oklahoma in connection with the unsolved disappearance of Cynthia "Cyndi" Dawn Kinney, a 16-year-old cheerleader last seen leaving her aunt and uncle's laundromat on June 23, 1976.

When Osage County Sheriff Eddie Virden visited him at the El Dorado Correctional Facility in Kansas in late April with questions about the case, he told Fox News Digital two other unexpected investigators showed up, too.

A detective from Missouri he referred to only as "Show Me" and an investigator from Kansas he dubbed "Yellow Brick Road" asked him about the disappearance of Shawna Garber, 53, on Halloween in 1990.

SERIAL KILLER BTK LAYS OUT ALIBI AMID NEW QUESTIONING OVER 1976 OKLAHOMA COLD CASE

The serial killer BTK, Dennis Rader, is led from a Sedgwick County, Kansas, courtroom after his arraignment on 10 counts of murder, May 3, 2005. Inset: a portrait of Cynthia Dawn Kinney and an artist's depiction of what Shawna Garber may have looked like at the time she died. (Reuters/Pool/Bo Rader/Wichita Eagle | National Missing and Unidentified Person System | MacDonald County Sheriffs Office)

The Kansas woman was raped, strangled and found dead a month later in Missouri, but authorities could not identify her remains until 2021 through DNA testing.

Rader denied involvement in both cold cases, and while he said he was "done" speaking with Virden, he said he "enjoyed" meeting with the investigators on Garber's case.

SERIAL KILLER BTK REVEALS HE'S BEEN QUESTIONED AGAIN IN 1976 COLD-CASE KIDNAPPING OF CYNTHIA DAWN KINNEY

Cynthia Dawn Kinney, shown in 1976, was last seen wearing blue jeans and a peach blouse as she left the Osage Laundromat and got into a beige Plymouth with two women in 1976. (National Missing and Unidentified Persons System)

"They brought a lot of info I could look over, codes, maps, my old BTK logs, etc.," he told Fox News Digital. "I did sign a Miranda with them and grant of transactional Immunity."

However, he added, he found another surprise when he returned to his cell.

"Everything that I had wrote on or kept was gone," he said. "Later that day, one box returned with no reason why."

A letter written by Dennis Rader, aka BTK, was received at the Wichita Eagle on Oct. 3, 2014. (Brian Corn/Wichita Eagle/Tribune News Service via Getty Images)

Virden previously told Fox News Digital he could not discuss specifics in the case and said the investigation would be thorough and fair while calling it premature to talk about charges or an arrest.

"I can't tell you whether we're going to come up with anything or whether we’re not," he said. "We won't leave anything uninvestigated."

BTK KILLER NOT INVOLVED IN OKLAHOMA COLD CASE, DAUGHTER SAYS, DESPITE REPORTS HE WAS QUESTIONED IN PRISON

Cynthia Dawn Kinney was last seen on June 23, 1976, in Pawhuska, Oklahoma. Dennis Rader, also known as the serial killer BTK for his method of using "bind, torture, kill" on victims, was active about two hours away in Wichita at the time and says he has now been questioned twice in the case. (National Missing and Unidentified Person System | Jeff Tuttle-Pool/Getty Images)

Rader told Fox News Digital that he committed only the 10 murders he confessed to after his arrest in 2005.

He had previously waived his Miranda rights and agreed to speak with Virden's office and denied having been in Oklahoma at the time of Kinney's disappearance.

She vanished 10 years before he began leading Boy Scouts on camping trips in the region in the 1980s, he said, and he didn't go there to work for the U.S. Census until 1990.

El Dorado Correctional Facility is where Dennis Rader, aka the BTK serial killer, is serving consecutive life sentences. (Larry W. Smith/Getty Images)

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Police arrested him in 2005 after years of cat-and-mouse games in which he taunted investigators and the media with messages, ultimately leading police to his doorstep. He had given himself the nickname "BTK" in reference to his preferred method of murder – "bind, torture, kill."

Rader is serving consecutive life sentences in a Kansas prison for the 10 slayings between 1974 and 1991. According to the serial killer, he was inactive between the first slayings, which involved victims in two attacks in 1974, and the attacks on the third and fourth victims in 1977.

Serial killer Dennis Rader, aka BTK, stands before Sedgwick County District Court Judge Greg Waller as sentencing is read on Aug. 18, 2005, in Wichita, Kansas. (Bo Rader-Pool/Getty Images)

Rader's daughter, Kerri Rawson, told Fox News Digital she does not believe either cold case fits the distinct patterns of her father's other murders, which involved stalking his victims, keeping journals, home invasion attacks and taking "trophies."

She said she has no knowledge of him having reason to be in Oklahoma in June 1976 and noted that Halloween in 1990 came on a weekday.

"Best I can recall, we were camping at Toronto State Park the weekend before Halloween 1990, but [we] would not have been out camping midweek due to school and work," she said. "Dad was traveling a good deal for the Census from mid ‘88, early ’89 till mid ‘90, but I believe he was laid off before the fall of ’90. He was likely home celebrating Halloween with my family in 1990, but I don’t know for sure."

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But Rader also said the investigators from Missouri and Kansas had questioned him about several entries in his journals, which he referred to as his projects titled "Bell," "Iron Mountain" and "Prairie."

They also asked him about a break-in and entry in Topeka, Kansas, he said.

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