Investigation Discovery TV Guide — Sunday TV Listings & Schedule

Browse the full Investigation Discovery TV guide for Sunday, 20 September 2026. 24 programmes listed , including 6 tonight. US listings updated daily — scroll down to tonight's highlights or use the day tabs above to browse the weekly schedule.

Early Morning

00:00 1h

Who the (Bleep) Did I Marry?

S7 · E5 · Love and Death in Vail Documentary

Love and Death in Vail

Shawnie and Ron develop a romance and move in together, but his erratic behavior turns from manipulative to criminal, forcing her to confront Ron's secret life.
01:00 1h

Who the (Bleep) Did I Marry?

S7 · E4 · Unholy Matrimony Documentary

Unholy Matrimony

When a polygamous Mormon cult leader selects 16-year-old Carol Dennis as his next wife, it is only the beginning of her decades-long hell on earth.
02:00 1h

Who the (Bleep) Did I Marry?

S7 · E6 · The Knockout Documentary

The Knockout

A former pro boxer marries a beautiful brunette and finds himself in the fight of his life, but then he receives a warning that his wife is hiring a hit man.
03:00 1h

Who the (Bleep) Did I Marry?

S7 · E5 · Love and Death in Vail Documentary

Love and Death in Vail

Shawnie and Ron develop a romance and move in together, but his erratic behavior turns from manipulative to criminal, forcing her to confront Ron's secret life.
04:00 1h

Who the (Bleep) Did I Marry?

S7 · E1 · Duty, Honor, Deception Documentary

Duty, Honor, Deception

When a colonel's wife discovers her husband's startling double life, she must choose between her own future and the good of the U.S. military.
05:00 1h

Someone You Thought You Knew

S1 · E3 · The Wolf & The Sheep True

The Wolf & The Sheep

When 26-year-old mother Tabatha Bryant, was found shot and stabbed at her home, her husband Kevin claimed that he had nothing to do with his wife's murder.

Morning

06:00 1h

Someone You Thought You Knew

S1 · E1 · Killer Collection True

Killer Collection

When Gary and Jan Tyrrell are murdered in a suburb in Springfield, Mo., their family and neighbors suspect a longtime friend and coworker to be the killer.
07:00 1h

48 Hours on ID

S22 · E7 · A Death in the Stairwell True

A Death in the Stairwell

A man lies critically injured at the foot of a staircase, and investigators initially see a tragic fall. Later, medical findings reopen hard questions.
08:00 1h

48 Hours on ID

S22 · E8 · Help Find Molly Bish's Killer True

Help Find Molly Bish's Killer

With her sister's murder long unsolved, a woman turns to social media to seek leads. Her online plea revives a haunting case, drawing new attention.
09:00 1h

48 Hours on ID

S22 · E1 · The Boy Who Killed His Twin True

The Boy Who Killed His Twin

A teenager wakes up to a nightmare after a late night 911 call reveals a shocking crime inside his home. Investigators confront a rare claim.
10:00 1h

OJ Unseen: Exploitation of Evil

S1 · E1 · He's Back Documentary

He's Back

Never-before-seen footage from O.J. Simpson's prank show reveals how a volatile comeback attempt unraveled. Truths test the ethical boundaries of the media.
11:00 1h

OJ Unseen: Exploitation of Evil

S1 · E2 · You Should Be Afraid of Me Documentary

You Should Be Afraid of Me

A volatile production tracks O.J. Simpson as he performs pranks for a hidden camera show, exposing uneasy encounters and a carefully crafted persona.

Daytime

12:00 1h

OJ Unseen: Exploitation of Evil

S1 · E4 · It Has Escapability Documentary

It Has Escapability

During week two, the chaotic production captures O.J.'s drunken descent as he revisits his past, blurring performance and reality while seeking validation.
13:00 1h

OJ Unseen: Exploitation of Evil

S1 · E3 · Reckoning with Reality Documentary

Reckoning with Reality

Never-before-seen footage from O.J. Simpson's prank show reveals how a volatile comeback attempt unraveled. Truths test the ethical boundaries of the media.
14:00 1h

The Murder Tapes

S5 · E4 · The Body in the Truck True

The Body in the Truck

Police investigate the death of 56-year-old Steven McQuay after his badly beaten body is found in the back of a pickup truck in Jonesboro, Arkansas.
15:00 1h

The Murder Tapes

S5 · E4 · Three Loud Booms True

Three Loud Booms

A young man is shot dead in his own garage in Maricopa, Ariz., in a planned ambush, and police must investigate a romance gone wrong to find his killer.
16:00 1h

The Murder Tapes

S5 · E5 · Midnight on Autumn St. True

Midnight on Autumn St.

A late-night shooting at an apartment complex in Hot Springs, Ark., leaves a young man dead in a bad drug deal, and police question the person responsible.
17:00 1h

Evil Lives Here

S9 · E16 · My First Love Hunted People Documentary

My First Love Hunted People

Christina meets Loren, but Christina thinks she's the lone target of his rage until a trail of clues reveals that Loren and his best friend are serial killers.

Evening

18:00 1h

Evil Lives Here

S9 · E4 · Our Little Sister, the Monster Documentary

Our Little Sister, the Monster

Heather terrorizes her siblings David and Crystal from a young age and later, they hope she'll change when she becomes a mom, but she only gets worse.
19:00 1h

Evil Lives Here

S9 · E5 · They Stole My Childhood Documentary

They Stole My Childhood

Abby's life takes a dark turn when her aunt and uncle adopt her, but a blessing turns into a nightmare as she realizes she's living with predators.
20:00 1h

Evil Lives Here

S9 · E11 · He Saved Her Life, Then Took It Documentary

He Saved Her Life, Then Took It

Betty sees that her sister's son, Chance, has a dark side as he lacks empathy and becomes violent, until he explodes in a fit of rage.
21:00 1h

Evil Lives Here

S9 · E23 · I Know Who the Real Monster is Documentary

I Know Who the Real Monster is

When Ryan's mother marries Blaine Nelson, he hopes he'll gain a fun-loving stepdad but instead, all he gets is chaos, pain and fear.
22:00 1h

Signs of a Psychopath

S6 · E9 · I Had Everybody Fooled Other

I Had Everybody Fooled

When a mother, covered in blood and holding a barely breathing newborn, arrives at the hospital, medical staff uncover a faked birth.
23:00 1h

Toxic

S2 · E1 · Don't Go Home True

Don't Go Home

Jenn Holman fell hard for Jesse Winnick; magnetic, dangerous and impossible to leave. One phone call reveals how close she comes to becoming his next victim.

Early Morning

Morning

Daytime

Evening

Related channels