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

A series of non-fiction investigations that explore such themes as jealousy, murder and deceit.

48 Hours on ID

The Conspiracy to Murder Jennifer Dulos (P)

Jessy Kurczewski calls police to report that she found Lynn Hernan dead in her recliner; the toxicology report shows a toxic ingredient in Lynn's blood and the authorities take a closer look at Jessy.

Death by Eyedrops

First responders find Kristen Trickle clinging to life and attempt CPR, but she does not survive; the coroner rules her death a suicide, but police and prosecutors are skeptical and charge her husband with murder.

Kristen Trickle Autopsy of the Mind

After her husband dies of an apparent overdose, Kouri Richins writes a children's book about grief; she's charged with his murder.

The People v. Kouri Richins

Heidi Firkus calls 911 after her husband claims an intruder is breaking into their Minnesota home; Heidi ends up dead, and the case remains cold for 10 long years until a new investigator takes a fresh look.

Death at the Front Door - Who Shot Heidi Firkus?

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S20 E4 | Death at the Front Door - Who Shot Heidi Firkus?