Plot Synopsis

This series investigates mysteries -- some from national headlines and others that go relatively unnoticed -- by using personal accounts and expert analysis to take viewers through every twist and turn. Paula Zahn uses her name and journalistic integrity to score exclusive interviews with subjects who shed new light on each case, lifting the secrecy on acts of deceit, malice and revenge in the search for truth and, indeed, justice.

Season 7 of ON THE CASE premiered on Sunday, December 16, 2012 at 10pm ET, with a season opener, "A Tale Tell Call," that features a dating service that receiving strange calls that helped police solve a murder.

Six months later, the eighth season of ON THE CASE debuted on Sunday, June 23, 2013 at 10pm ET, featuring a Valentine's Day rendezvous that ended with a killing. After a three-month break,

ON THE CASE WITH PAULA ZAHN returned for its ninth season on Sunday, December 22, 2013 at 10pm ET/PT with the story of a mother of four stabbed to death in her bathroom -- but the case goes unsolved for many years until a mysterious v-shaped wound on her forehead finally leads police to her killer decades later.

After a four-month break, ON THE CASE WITH PAULA ZAHN returned for its tenth season on Sunday, August 3, 2014 at 10pm ET/PT on Investigation Discovery. In the season opener, "Snake in the Grass," a cloud of smoke leads two truckers to a shocking discovery, and the smoldering remains of a teenage girl.

Season 11 premiered on Sunday, February 22, 2015 at 10pm ET/PT on Investigation Discovery. In the season opener, "In Plain Sight," a beautiful young woman is murdered, but the evidence points detectives to a killer hiding in plain sight.

The twelfth season of ON THE CASE WITH PAULA premiered on August 30, 2015 on Investigation Discovery. In the season opener, "A Harvest of Grief," a trail of blood and broken cornstalks lead police to the body of a beautiful young girl.

Season 13 of ON THE CASE WITH PAULA premiered on Sunday, March 6, 2016 at 10pm ET/PT on Investigation Discovery. In the season opener, "Deep Wounds," San Diego police race to catch a killer with an unthinkable calling card after Navy electrician Michael Jacobs comes home to find his wife Suzanne and three-year-old son, Colin, dead.

Investigation Discovery premiered Season 14 of ON THE CASE WITH PAULA ZAHN on Sunday, August 28, 2016 at 10pm ET/PT. In the season opener, "22 Hours of Terror," a 12-year old girl is kidnapped, following a brutal home invasion...Can police find her and her abductor before its too late?

On Sunday, May 28, 2017 at 10pm ET/PT, Investigation Discovery premiered the fifteenth season of ON THE CASE WITH PAULA ZAHN. In the season opener, "Deadly Deception," a father of four is gunned down during a vicious attack, but as police investigate the murder, they discover that nothing about the crime is what it appears to be.

Season 16 of ON THE CASE WITH PAULA ZAHN premiered on Sunday, October 29, 2017 at 10pm ET/PT on Investigation Discovery. The season opener, "A Nightmare in Idaho Falls," follows the tragic double homicide of Reeda Roundy and Betty Gray who were found in Roundy's home, along with a satanic message written in blood. It said "Satan Loves You," and appeared to have been part of a carefully planned ritual. Detectives were puzzled, as neither murder had any signs of being ritualistic and both victims appeared to have died without a struggle. But as the investigation unfolded, detectives learned that nothing about the crime was as it appeared. In fact, it would take remarkable police work and insights from the families of both beloved mothers to finally piece together the stunning truth.

The 17th season of ON THE CASE WITH PAULA ZAHN debuted on Sunday, July 15, 2018 on Investigation Discovery. In the season opener, "Notes from a Killer," a young girl disappears off a quiet suburban street, marking the beginning of a terrifying game of cat and mouse between police and her abductor.

ON THE CASE WITH PAULA ZAHN returned for its 18th season on Sunday, February 24, 2019 on Investigation Discovery. In the season opener, "A Hero Betrayed," a hero firefighter is found savagely murdered in his own home, and the trail of evidence takes police on a twisting and tension-filled journey to justice. After a four-month break, ON THE CASE WITH PAULA ZAHN returned with new episodes on Sunday, July 15, 2018 at 10pm ET/PT on Investigation Discovery. When a young girl disappears off a quiet suburban street, it marks the beginning of a terrifying game of cat and mouse between police and her abductor. On Sunday, February 24, 2019 at 10pm ET/PT, ON THE CASE WITH PAULA ZAHN returned with new episodes. In the winter premiere, "A Hero Betrayed," a hero firefighter is found savagely murdered in his own home, and the trail of evidence police find takes them on a twisting and tension-filled journey to justice.

Season 19 of ON THE CASE WITH PAULA ZAHN premiered on Sunday, November 3, 2019 at 10pm ET/PT on Investigation Discovery. In the season opener, "Driven to Murder," police find a young woman who has been run over by her own car, marking the beginning of a terrifying murder mystery.

Investigation Discovery premiered the 20th season of ON THE CASE WITH PAULA ZAHN on Sunday, April 26, 2020 at 10pm ET/PT. In the season opener, "Shadow of Suspicion," a young woman travels to California in pursuit of a Hollywood dream and winds up the victim of a savage homicide.

Season 23 of ON THE CASE WITH PAULA ZAHN premiered on Sunday, August 8, 2021 at 10pm ET/PT on Investigation Discovery. In the season opener, "Devil in a Cowboy Hat," a young woman's strange encounter with a man outside her home becomes the thread that unravels a terrifying murder mystery.

The 24th season of ON THE CASE WITH PAULA ZAHN premiered on Sunday, February 20, 2022 at 10pm ET/PT on Investigation Discovery. In the season opener, "A Mother Knows," a female active-duty soldier dies in a brutal attack during a night out with members of her unit; police try to determine if a secret fear she mentioned to her mother is the motive for her murder.

On Sunday, September 4, 2022 at 10pm ET/PT, Investigation Discovery premiered the 25th season of ON THE CASE WITH PAULA ZAHN. The new season debuts with the series' 350th episode, "From Zero to Murder." As police investigate the brutal murder of a young woman, they ask themselves a chilling question: was the ambush-style shooting that ended Alisha Canales-McGuire's life actually a terrifying case of mistaken identity? Paula sits down with investigators who cracked the case and the victim's sister and intended target, Amanda, to get to the bottom of one of the most bizarre murder investigations to rock the quiet suburb of Everett, Washington.

Season 26 of ON THE CASE WITH PAULA ZAHN debuted on Wednesday, May 3, 2023 at 10pm ET/P on Investigation Discovery. Journalist Paula Zahn continues to feature storytelling and original interviews that go beyond the headlines to reveal first-person accounts and expert insights of those connected to the cases, showcasing the full scope and impact of murder. Zahn talks to investigators, witnesses, victims' families and incarcerated criminals.

The 27th season of ON THE CASE WITH PAULA ZAHN premiered on Wednesday, March 6, 2024 at 10pm ET/PT on Investigation Discovery. In the season opener, "Wrong Place, Wrong Time," police investigate the terrifying mystery behind the murder of two teenage girls; either they were victims of a targeted attack, or they had simply been in the wrong place at the wrong time.
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On Wednesday, April 24, 2024 at 10pm ET/PT, Investigation Discovery premiered "Where Is Alexis?," the Season 27 finale of ON THE CASE WITH PAULA ZAHN. Police uncover a trail of evidence that indicates that a missing young woman has been the victim of foul play.