'20/20 on ID' Details How Unabomber's Family Ratted Him Out to Feds (Exclusive Video)

Step aside, Steven Avery: Investigation Discovery’s next “20/20 on ID Presents Homicide” will tell the unusual story of how the Unabomber was eventually brought to justice, TheWrap has learned exclusively.

Wednesday’s hour, hosted by “Nightline” anchor Byron Pitts, revisits how Ted Kaczynski was discovered and ratted out by his own brother David and sister-in-law Linda.

The Unabomber had evaded authorities for 18 years while his homemade bombs left three dead and nearly two dozen people injured. On the ID presentation, Linda Patrik speaks out for the first time about how she initially came to suspect her brother-in-law Ted was the infamous Unabomber. Eventually, a reluctant David realized she was probably right.

Watch the video above to learn why.

Also Read: 8 'Making a Murderer' Updates Since Steven Avery Got a New Lawyer

On next week’s airing, Linda and David will recount the anguish they endured in trying to rule out Ted as a suspect — and when they couldn’t, the delicate process of approaching the FBI while hoping to remain anonymous informants.

The episode also features Pitts’ interview with the one of the lead FBI special agents at the time of Kaczynski’s capture, Kathleen Puckett. She will walk viewers through the investigation, sharing the FBI missteps, red herrings, and moments up to and including the capturing of Kaczynski in his rural Montana cabin.

Additionally, one of Kaczynski’s victim’s, Gary Wright, revisits the parking lot where he unknowingly picked up a disguised bomb that nearly killed him.

The second episode of the awkwardly named five-part series “20/20 on ID Presents Homicide” premieres Wednesday at 10/9c.

'Making a Murderer': Where Are They Now? (Photos)

Ken Kratz: The Avery case prosecutor says he has overcome an addiction to prescription pain pills since the trial and gone through the public humiliation of a sexting scandal. He maintains his license and now serves as a defense attorney.
Netflix
Mike Halbach: The brother of murder victim Teresa Halbach has served as a Halbach family spokesperson is now the director of Football Technology for the Green Bay Packers.
Green Bay Packers
Sgt. Andrew Colburn is now Lt. Andrew Colburn. He holds the title in the Detective Division of the Manitowoc County Sheriff's Office.
Netflix
Gregory Allen: Allen, who was found to have committed the rape for which Steven Avery spent 18 years behind bars, is serving a 60-year prison sentence for a 1995 sexual assault. He's up for parole in October 2016.
Netflix
Sheriff Tom Kocourek: Kocourek retired from his post in 2001. He was named as a defendant in a $36 million federal lawsuit brought forward by Avery.
Netflix
Angenette Levy: Levy, a journalist who garnered a lot of "Making A Murderer" playback attention for asking the tough questions, is now an on-air reporter for WKRC in Cincinnati.
Netflix
Aaron Keller: Levy, another reporter, is now an English/Communications professor at NHTI, Concord’s Community College in New Hampshire.
Netflix
Dean Strang: Strang recently said that he occasionally speaks with Avery, his former client. The defense attorney is not shying away from the spotlight, and recently took part in a Facebook Q&A. The trial lawyer is a partner at Strang Bradley LLC in Madison.
Strang Bradley LLC
Denis Vogel: The ex-DA is now an attorney at Wheeler, Van Sickle and Anderson, S.C., where he concentrates on commercial litigation, with a focus on matters involving utilities, electricity use and distribution, and cellular telecommunications.
Wheeler Law
Steven Avery: Well, he's in jail -- the Waupun Correctional Institute, to be exact.
The Innocence Project
Brendan Dassey: On August 12, 2016, a federal judge overturned his 2007 conviction for first-degree intentional homicide, second-degree sexual assault, and mutilation of a corpse. Avery's nephew had been sentenced to Avery's nephew sentenced to life with no parole for 41 years for Halbach's murder.
Netflix
Sheriff Ken Peterson: Peterson retired as Manitowoc County sheriff in 2007, just two years after he now-famously told a TV station it would have been "a whole lot easier to eliminate [Avery] than it would to frame him."
Netflix
Barb Tadych: Brendan's mom has publicly kept a low profile since all the "Making a Murderer" hype began. Tadych appears to remain in the area, as her most recent social media check-in was at a Center for Diagnostic Imaging in Appleton, Wis.
Netflix
Sandy Greenman: It appears that Avery and Greenman are still an item. Per what appears to be her Facebook page, Greenman visited Avery in prison as recently as Monday.
Bustle
James Lenk: Lenk has managed to keep one of the lowest profiles of the entire "Making A Murderer" gang. It is unclear whether has a Netflix subscription.
Netflix
Jodi Stachowski: Steven's ex-fiancee has had some legal troubles. In April 2007, she was found guilty of using worthless checks. She was arrested three times in 2009. Since then, Stachowski has stayed out of major criminal trouble.
Bustle