DNA Breakthrough Solved BTK Killer Case After 31 Years
How familial DNA testing from a suspect's daughter led to the arrest of serial killer Dennis Rader in 2005
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Quick Facts
Quick Facts
Dennis Lynn Rader, born March 9, 1945, terrorized Wichita and Park City, Kansas, for nearly two decades as the BTK killer—a name derived from his modus operandi: bind, torture, kill. Between 1974 and 1991, he murdered at least 10 people, typically targeting women in their homes, where he would restrain them with household items, torture them, and kill them by strangulation or suffocation. The case went cold after 1991 when Rader stopped killing and communicating with authorities.
For 13 years, the BTK case remained dormant—until 2004, when Rader unexpectedly resumed contact with media. He sent 11 letters and packages to *The Wichita Eagle* and other outlets, including crime scene photographs and personal items belonging to Vicki Wegerle, a 1986 victim. This renewed communication would prove to be his undoing.
Wegerle's case had long puzzled investigators. Her death was not definitively linked to BTK until Rader's 2004 letter arrived with her driver's license and crime scene images. Critically, DNA evidence recovered from under her fingernails—preserved from the original 1986 investigation—remained in police custody. Detectives now had a biological sample they could use to identify her killer.
However, direct DNA database matches yielded nothing. Police tested DNA from more than 1,300 local men, including police officers and university professors. No direct match emerged. Investigators then turned to an emerging forensic technique: familial DNA testing, which identifies biological relatives of suspects by comparing genetic profiles to known samples.
The breakthrough came when detectives obtained a warrant to access a pap smear from Rader's 24-year-old daughter, a student at Kansas State University. The sample had been collected at a medical clinic and was available through standard medical records. When a laboratory in Topeka analyzed the genetic material, a familial match was confirmed between the daughter's DNA and the profile recovered from under Vicki Wegerle's fingernails—as well as DNA evidence from other crime scenes.
