NEW EPISODES

FRIDAY, JAN. 21

9:01-11:00 p.m. - 20/20

Idaho mom Lori Vallow's brother opens up in network exclusive about tragic family events.

'20/20' FEATURES FIRST TV NETWORK INTERVIEW WITH LORI VALLOW'S BROTHER WHO DISCUSSES DISAPPEARANCE AND MURDER OF HER CHILDREN

'20/20' Includes Never-Before-Seen Video of Her Husband Chad Daybell's Teachings and New Evidence From Police

'20/20' Airs Friday, Jan. 21 (9:01-11:00 p.m. EST), on ABC, Next Day on Hulu

Two years ago, the strange and horrific story of Lori Vallow gripped the nation when after falling in love with doomsday prepper and author, Chad Daybell, her children mysteriously disappeared and authorities later found them buried in his backyard. Now, as Lori and Chad both face charges in connection to the murders of her children, JJ Vallow and Tylee Ryan, ABC News contributor Ryan Smith sits down for the first TV network interview with her brother, Adam Cox. He opens up about her strange shift in behavior before the murders; her involvement with Chad and his doomsday beliefs; his thoughts on the alleged involvement of his brother, Alex Cox; and how these haunting events affected him and his family. "20/20" contains never-before-seen video of Chad's teachings and new home videos of the Cox family, including Alex at shooting practice. It also has newly released evidence from authorities, including video of police interviews with Lori, Alex, and Tylee and texts that Chad sent to Lori detailing his infatuation with her. The two-hour program includes interviews with "The Followers: Madness of Two" podcast host Sarah Treleaven, and producer and ABC News consultant Beth Karas; as well as interviews from the ABC News archives with Kay and Larry Woodcock, grandparents of JJ; Janis Cox, Lori's mom; Melani Pawlowski, Lori's niece; Chandler Police detectives who worked on the case; and friends of Lori and Chad. Chad pleaded not guilty to the charges he's facing. Lori is undergoing mental evaluations to see if she is competent for trial. "20/20" airs Friday, Jan. 21 (9:01-11:00 p.m. EST), on ABC, next day on Hulu.

ABC News' "20/20" is an award-winning primetime program anchored by David Muir and Amy Robach. A proven leader as a long-form newsmagazine for over 40 years, "20/20" features unforgettable, character-driven true-crime mysteries, exclusive newsmaker interviews, hard-hitting investigative reports and in-depth coverage of high profile stories. The two-hour "20/20" events air Fridays from 9:01-11:00 p.m. EST on ABC and are available to stream on ABC News digital platforms and Hulu. David Sloan is senior executive producer, and Janice Johnston is executive producer.