Browse the full Investigation Discovery TV guide for Sunday, 18 October 2026. 26 programmes listed , including 6 tonight. UK listings updated daily — scroll down to tonight's highlights or use the day tabs above to browse the weekly schedule.
Early Morning
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00:00 1h
The Curious Case of Natalia Grace
S1 · E5 · Barnett vs BarnettAt Michael's trial, he turns on his ex-wife while the judge makes a rulingAt Michael's trial, he turns on his ex-wife while the judge makes a ruling that could help his case. Plus, a mysterious witness comes forward -
01:00 1h
The Curious Case of Natalia Grace
S1 · E6 · Punch or Be PunchedAfter years of anticipation, Michael's trial is finally under wayAfter years of anticipation, Michael's trial is finally under way. A mysterious new witness appears and offers damning testimony that could ruin Michael -
02:00 1h
On the Case with Paula Zahn
S12 · E29 · New Year's Eve NightmareA woman finds a young mother murdered following a New Year's celebrationA woman finds a young mother murdered following a festive New Year's celebration. Can police trace her last known steps and find her killer -
03:00 1h
On the Case with Paula Zahn
S12 · E30 · Disconnected StoryA woman is found murdered in her homeWhen a woman is found murdered in her home, police use a frantic 911 call from the night of the crime to identify her killer -
04:00 1h
Mean Girl Murders
S2 · E1 · Church Camp KillerA group of girls begin lifelong friendships at church campA group of girls begin lifelong friendships at church camp. Life takes them down different roads and their bonds remain until one of them disappears -
05:00 1h
Mean Girl Murders
S2 · E2 · Queen vs. PrincessA Homecoming Queen and a Dairy Princess are murdered in WisconsinWhen a Homecoming Queen and a Dairy Princess are murdered in Marathon County, Wisconsin, detectives question a pool of suspects, from strangers to frenemies
Morning
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06:00 30m
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06:30 30m
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07:00 30m
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07:30 30m
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08:00 1h
Evil Stepmothers
S2 · E2 · Caught in Her CrosshairsThe family of a murdered Texas teenager discuss the incidentThe murder of Sherman High School graduate Kimberly Dunnachie in Arlington, Texas. Veronica Dunnachie fatally shot her husband Russ and stepdaughter Kimberly in 2014. Kimberly's stepfather and mother, Mike and Dianna Gillum, discuss the incident -
09:00 1h
Evil Stepmothers
S2 · E3 · Nanny NightmareThe crimes of Donna YaklichThe crimes of Donna Yaklich, who gunned down her husband - a Pueblo police officer - in the driveway of his home in December 1985 -
10:00 1h
Evil Stepmothers
S2 · E4 · A Murder You Can't IgnoreThe case of Colleen HarrisThe case of Colleen Harris, who was convicted of first-degree murder after gunning down her third husband Bob, a former US Forest Service supervisor, in January 2013, because she was worried about losing him -
11:00 1h
Evil Stepmothers
S3 · E2 · Selfish DesiresThe crimes of Rebecca OsborneThe crimes of Rebecca Osborne, who shot and killed second husband Jerry Barker in 1996. It transpired she had earlier shot and injured first husband John Osborne
Daytime
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12:00 1h
Still a Mystery
S5 · E27 · Suspects at LargeA dancer shot dead in her homeWhen a dancer was shot dead in her home, detectives tried to figure out who had a motive to kill her. A cigarette found at the scene was thought to be a clue. Plus, how in an ironic twist a woman vanished while looking for her missing friend -
13:00 1h
Still a Mystery
S5 · E28 · Charmed by a KillerA case in which a mother went missingA case in which a mother went missing from her home. Suspicion moved from one admirer to another, but a surprise confession seemed set to solve the mystery -
14:00 1h
Still a Mystery
S5 · E29 · My Brother's KeeperThe case of LeRyan NicholsonThe case of teenager LeRyan Nicholson, who went missing in 1998. It wasn't until March 2013, when a DNA sample confirmed a retrieved body was his -
15:00 1h
Still a Mystery
S5 · E30 · Murdered in Broad DaylightA woman stabbed to death in broad daylightWhen woman stabbed to death in broad daylight, police believed she knew her killer. Plus, how new evidence after a deadly house fire pointed to arson -
16:00 1h
American Monster
S4 · E11 · Momma's GirlThe case of protective father and grandfather Arthur BurneyThe case of fun-loving, protective father and grandfather Arthur Burney. One day he walked out on the family after apparently falling in love with a woman -
17:00 1h
American Monster
S4 · E12 · Too Good to Be TrueThe case of Amanda SchmittAmanda Schmitt was doing her dream job nannying two children. Her relationship with the father became romantic, but a happy ending did not lie in store
Tonight's Highlights
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18:00 1h
American Monster
S5 · E1 · Once a PrincessA case in which deceit and violence eventually turned deadlyA millionaire doctor and his wife enjoyed a glamorous lifestyle. However, behind closed doors, they were troubled by deceit and violence. When Samira Frasch died in the family swimming pool, police discovered a killer hiding in her midst -
19:00 1h
American Monster
S5 · E2 · Brothers in ArmsThe case of cousins Mark Corona and Paul StoepplerThe close bond between cousins Mark Corona and Paul Stoeppler was quickly severed when one of them was murdered in cold blood. Never-before-seen home movie video and shocking CCTV reveals what happened -
20:00 1h
American Monster
S8 · E5 · Brothers and SistersThe torrid relationship between Cindy Monkman and Michael ApeltWhen she reached 30, Cindy Monkman began seeking someone serious to spend her life with. Michael Apelt, a handsome German businessman, seemed to be the answer to her prayers. However, their first Christmas together turned into a horror story as got entangled in the conning schemes of the Apelt and his brother -
21:00 1h
Blood Runs Cold
S1 · E2 · Bonded by GriefThe murders of two young boysThe murders of two young boys. When the case went cold, their mothers begin their own quest for answers -
22:00 1h
Lethally Blonde
S2 · E6 · Killing King CobraA fire in Pennsylvania reveals the body of a pornographic film directorIn 2007, a devastating house fire in Dallas Township, Pennsylvania, reveals the nearly decapitated body of a pornographic film director -
23:00 1h
Who Hired the Hitman?
S1 · E5 · Dead Body ShopA garage with three dead bodies leads detectives to a crafty CasanovaA garage with three dead bodies leads detectives to a lurid affair, stories of embezzlement, and a crafty Casanova who mysteriously disappears