Investigation Discovery continues its heritage of providing in-depth, compelling documentaries & series that challenge viewers to think about key issues that shape our culture and define our world.

Investigation Discovery

After Michigan detectives find a popular hairstylist stabbed to death, their suspects include the victim's landlord, her married lover and an aggressive ex-boyfriend; an unexpected call ultimately leads police in the right direction.

A Time to Kill

The Cutting Edge

Investigation Discovery HD

As detectives reconstruct a single mom's final 24 hours, their suspicions turn to her fiancé, a co-worker and a violent ex-boyfriend; investigators discover a disturbing pattern of attacks and a predator with the master key.

Diamonds Are Not Forever

Investigation Discovery continues its heritage of providing in-depth  compelling documentaries & shows.

When Florida investigators find a retired Marine beaten then slain by a shotgun blast in his home, their suspect list grows from his estranged son to a mystery woman he'd just met to a possible serial killer.

Semper Fi or Die

On the sub-zero Canadian prairie, Royal Canadian Mounted Police discover a woman inside her hoarder home, a bloody ice-axe beside her; her adult nephew lies frozen in the bed of his pick-up; now, it's up to the Mounties to track down their killer.

Frozen Stiffs

Devoted father and aspiring boat captain Tray Phelps takes his last breath, murdered just steps from his front door; with no immediate leads, it's up to Missouri investigators to find the murderous manipulator at the heart of a sordid family plot.

It Takes Two to Tango

Bookkeeper Barbara Iske fails to arrive on time at the Michigan home of her wealthy client; five hours later, she's found executed in the driveway of that same client; ultimately, police reveal that Barbara's the victim of a dark family conflict.

Blood on the Books

In an affluent New York suburb, killers torture and beat millionaire Ben Novak in his hotel room; detectives soon discover that the businessman had many enemies, but one above all is the sadistic mastermind.

Heir to Murder

On New Year's Eve in rural Pennsylvania, someone assaults and sets 23-year-old Ashley Kline on fire, killing her. The list of prime suspects includes her best friend, a jealous boyfriend, and a recently released prison pen-pal convicted of sexual assault.

A Deadly Liaison

A gunman strikes down an Atlanta-area man in his SUV on the side of a highway; sheriff investigators discover the victim is not well-liked among some in his inner-circle; the killer eludes the law for 17 years.

Highway to Hell

A gunman kills volunteer police officer Laura Grillo in her suburban Dallas home; investigators must link a bombshell accusation to an email with a diabolical mastermind who thinks he can outsmart the law.

Devil at the Depot

A shooter guns down Cleveland's beloved fire department lieutenant on his driveway; as he fades away, 45-year-old William Walker tells the EMS as much as he can about the suspect who ambushed him.

Hero Betrayed

A late-night break-in at a Pennsylvania chain restaurant leaves assistant manager Terri Brooks brutally slain; when another female restaurant employee is murdered in a nearby town, detectives fear there's a serial killer on the loose.

Fast Food Cold Justice

Determined investigators must piece together the final hours of a victim's life to reconstruct the timeline, unlock the motive, and ultimately close in on the killer.

S6 E19 | It Takes Two to Tango