Monday, April 13, 2026

Investigation Discovery Turns Deadly This September

Anyone is capable of murder, and this September Investigation Discovery proves it. PORTAL TO THE UNKNOWN dives head-first into some of the stranger events in Canadian criminal and paranormal history (Sept. 8). DEADLY WOMEN returns with a new batch of murderous madams and law-breaking ladies for Season 5 (Sept. 3). Season 2 of SINS AND SECRETS investigates the effect murder has on communities (Sept. 20). The criminal cases continue with DEADLY INTENT as viewers go behind the yellow tape to get the full story (Sept. 26).

September highlights for Investigation Discovery include:

NEW SERIES

PORTAL TO THE UNKNOWN

Saturdays at 10 p.m. ET/11 p.m. PT, beginning Sept. 8

Viewers head into the PORTAL TO THE UNKNOWN with new 27-part Canadian series. This docudrama-style series retells some of the stranger events in Canadian history; dealing with ghosts, paranormal events, lost treasures and bizarre murders.

RETURNING SERIES:

DEADLY WOMEN

Mondays at 10 p.m. ET/11 p.m. PT, beginning Sept. 3

DEADLY WOMEN returns with a bang for Season 5 of the bone-chilling series that features history’s most alluring female killers. Each episode profiles four famous cases from the past; killers and their victims are brought to life by elaborate dramatized reconstructions. The 20-part series spans four centuries and seven countries to explore the makings of these deadly women.

SINS AND SECRETS

Thursdays at 10 p.m. ET/11 p.m. PT, beginning Sept. 20

This immersive true-crime series returns for Season 2 with even more SINS AND SECRETS. Each episode of the 13-part series centres around one particular crime and shows how that crime altered the community in which it occurred, revealing how the people and place have been irrevocably changed by the terrible aftermath. Cities spotlighted in the series include Aspen, Nantucket, New Orleans, Knoxville, Albuquerque and Shreveport.

DEADLY INTENT

Wednesdays at 8 p.m. ET/9 p.m. PT, beginning Sept. 26

DEADLY INTENT takes viewers behind the yellow tape in Season 2 of this killer series. The 10-part series follows investigators as they work to capture modern monsters, revealing that anyone is capable of murder.

View the primetime grid as well as the complete september schedule on Investigation Discovery page on falltvpreview.com

Related Articles

TV Series News

NETWORK

Alert: Missing Persons Unit (FOX / CTV) has been cancelled after 3 seasons.

The Cleaning Lady (FOX / CTV) has been cancelled after 4 seasons.

All American (The CW / Showcase) has beeen renewed for an 8th and Final Season.

Scrabble & Trivial Pursuit (The CW) have been renewed for a Second season.

SPECIALTY

The Chi (Showtime / Crave) has been renewed for an Eighth season.

Yellowjackets (Showtime / Crave) has been renewed for a Fourth season.

Dexter: Resurrection (Showtime / Paramount+ Canada) Premieres July 11, 2025.

It's Always Sunny in Philadelphia (FXX / FXX Canada) Season 17 Premieres July 9, 2025.

The Gilded Age (HBO / HBO Canada) Season 3 Premieres June 22, 2025.

STREAMING

Bad Thoughts (Netflix) has been renewed for a Second season.

Star Trek: Strange New Worlds (Paramount+) has been renewed for a Fifth and Final season.

The Diplomat (Netflix) Season 3 Premieres Fall 2025.

SkyMed (Paramount+ / CBC) has been renewed for a Fourth season; it will air exclusively on Paramount+.

Slow Horses (Apple TV+) Season 5 Premieres September 24, 2025.

Harry Wild (Acorn TV) has been renewed for a Fifth season.

Laid (Peacock / W Network) has been cancelled after 1 season.

The Morning Show (Apple TV+) Season 4 Premieres September 17, 2025.

The Terminal List (Amazon Prime Video) Season 2 Premieres August 27, 2025.

Hacks (Max / Crave) has been renewed for a Fifth season.

The Wheel of Time (Amazon Prime Video) has been cancelled after 3 seasons.

Women in Blue (Apple TV+) has been renewed for a Second season.

Platonic (Apple TV+) Season 2 Premieres August 6, 2025.

The Bondsman (Amazon Prime Video) has been cancelled after 1 season.

Lupin (Netflix) has been renewed for a Fourth Season.

My Life with the Walter Boys (Netflix) has been renewed for a Third season.

Survival of the Thickest (Netflix) has been renewed for a Third and Final season.

The Diplomat (Netflix) has been renewed for a Fourth season.

Forever (Netflix) has been renewed for a Second season.

The Four Seasons (Netflix) has been renewed for a Second season.

Bridgerton (Netflix) has been renewed for 5th & 6th seasons.

The Bear (FX on Hulu / Disney+ Canada) Season 4 Premieres June 25, 2025.

Peacemaker (Max / Crave) Season 2 Premieres August 21, 2025.

Foundation (Apple TV+) Season 3 Premieres July 11, 2025.

Acapulco (Apple TV+) 4th and Final Season Premieres July 23, 2025.

The Summer I Turned Pretty (Amazon Prime Video) 3rd and Final season Premieres July 16, 2025.

Wednesday (Netflix) Season 2, Part 1 Premieres August 6, 2025; Part 2 Premieres September 3, 2025.

The Sandman (Netflix) Season 2, Part 1 Premieres July 3, 2025; Season 2, Part 2 Premieres July 24, 2025.

The Buccaneers (Apple TV+) Season 2 Premieres June 18, 2025.

What's On?

What’s On? June 15 - 28:

SERIES PREMIERE
Countdown
Hell Motel
Inside
Ironheart
Long Bright River
Smoke
We Were Liars
The Veil
The Waterfront

SEASON PREMIERE
The Bear
The Buccaneers
The Chosen
The Gilded Age

SEASON FINALE
Adults
Leverage: Redemption
Scrublands
Sullivan's Crossing
The Walking Dead: Dead City

Latest Articles