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 HD

Investigation Discovery

A female executive's jog ends in murder; DNA links a frail inmate to the Package Killer, a predator who hid women's bodies in alarming ways; as interrogations unfold, two seemingly ordinary men reveal decades of cold, predatory violence.

Signs of a Psychopath

Deviant Desires

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

Experts look at a subset of psychopaths who are motivated by their heightened sexual urges and fantasies; this subset of offenders doesn't just enact physical violence but sexual violence toward their victims and is known as the sexual psychopath.

The Sexual Psychopath

Police first arrest a man for discharging a firearm and soon discover dead bodies inside his apartment; detectives try to make sense of the bloody crime scene and a psychopath willing to murder those closest to him.

Guess I'm a Bad Dad

An early morning fire inside an apartment complex soon reveals something worse, the dead bodies of a young woman and an infant boy; detectives find a psychopath who appears polite and gentle, then later as a pawn of imagined demons.

There's Eyes in the Closet

After the shooting deaths of father, mother, and two adolescent boys in their suburban Baltimore home, investigators realize it's not a robbery gone wrong but rather the execution of a loving family, done by a callous psychopathic killer.

It's for You Guys to Find

A killer guns down a 46-year-old woman, and detectives discover that a fleeing Sheriff's Deputy is the assailant; less than 48 hours later, they arrest him and reveal an unrepentant psychopath capable of executing the love of his life in cold blood.

I Love You to Death

When a young mother goes missing, her husband joins the search; police discover her dismembered body in a stack of bins; detectives find her husband to be a typical suburban dad, but learn a murderous psychopath lurks within.

It's Despicable and Gruesome

A vehicle plows down a 75-year-old military veteran on a country road in an apparent hit-and-run; when a young man confesses to the crime, detectives quickly learn they've encountered a psychopath with an intense desire to thrill kill.

I Just Smiled and Laughed

Police search for a killer who guns down a man in a parking lot.

He Went Boom

A psychopathic killer confesses decades after the murders of three women.

That Anger Would Rise Again

Authorities grow concerned when a 25-year-old woman reports her 50-year-old father and 6-year-old daughter are missing; police discover their dead bodies and uncover the truth: she is a psychotic killer.

Just Don't Want to Go to Jail

Police engage in a massive manhunt to find a killer on a murder spree of revenge, taking the lives of his girlfriend, cousin, and a man he considers a father figure; once captured, he proclaims that he simply wants to be heard.

I'm Already Seeing Red

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Revisiting some of the most dangerous killers in modern history to see which psychopathic traits they exhibited.

S10 E6 | It's Despicable and Gruesome