Investigation Discovery HD (Pacific)

A man crashes into the back of a woman's vehicle; officers respond to the scene only to find her car abandoned; witnesses point to the other driver, and detectives are horrified to discover a sadistic psychopath who admits to murder.

A woman dies in a brutal stabbing at home; police quickly locate the prime suspect, her ex-boyfriend Antoine Bynum; in his interrogation, he appears to have a psychotic episode until detectives discover it's merely the ruse of a deranged psychopath.

A longtime nurse confesses to helping end the lives of numerous elderly patients at multiple nursing homes; detectives discover this is no angel of mercy; behind her unsuspecting persona lies a ruthless psychopath.

The Tourniquet Killer terrorizes young girls across Houston, Texas, and when advances in DNA finally lead to his arrest, this psychopath eagerly confesses to multiple murders; weeks before his execution, he grants one interview in the spotlight.

Elisabeth and Frank reconnect after years apart, and Elisabeth's mother, Cheri, watches as their toxic relationship blows up and leads to a devastating fire; when the smoke clears, one lies dead, and the other sits behind bars.

During the day, Lorenzo Gilyard is a soft-spoken and well-liked man, but at night, he's a monster, preying on women; his best friend, a trained social worker, misses the signs; going inside the prison to get answers from the notorious serial killer.

Patrick Piddock knows there's something dark inside him, and his daughter, Fawn, and those around him suffer from his sudden outbursts; he's warned that one day he'll kill someone, but no one knows how dangerous he is until he takes a life.

Michelle looks up to her father, but over time, fear and disgust replaces respect; as a teen, her world changes forever as horrific revelations buried for years finally emerge; Michelle's father must answer for his crimes.

A chilling look inside the homes of actual killers; a peek at their prisons to hear from killers themselves, resulting in powerful, unsettling and contentious encounters.

Amy grows worried about her brother Joel's violent and erratic behavior, and his girlfriend, Melanie, suffers abuse at his hands; when a man is shot dead, Joel is engaging police in a lethal standoff.

Tony believes his mother found happiness with Deputy Dave Rogers, until he sees the truth; when two women are found dead, the illusion shatters, revealing a corrupt cop capable of unimaginable evil.

A killer brutally murders an elderly couple, and detectives quickly focus on their 17-year-old grandson who lives with them; when they finally capture him, they uncover a charismatic young psychopath with a hunger for fast food and revenge.

When a grandmother vanishes, her grandson spins a twisted narrative about her demise and the disturbing location of her body inside a freezer; it doesn't take long for detectives to uncover the killer responsible, a parasitic psychopath.

When remains found in a swamp are identified, friends are stunned; Mindi Kassotis was supposed to have died in a hospital; five months later, police say she was murdered, and focus on her husband, Nick, to unravel how she died twice.

Police find four victims in the smouldering wreckage of an Oklahoma City house fire and one of the victims starred in the hit TV series Cathouse.

A killer brutally murders an elderly couple, and detectives quickly focus on their 17-year-old grandson who lives with them; when they finally capture him, they uncover a charismatic young psychopath with a hunger for fast food and revenge.

When a grandmother vanishes, her grandson spins a twisted narrative about her demise and the disturbing location of her body inside a freezer; it doesn't take long for detectives to uncover the killer responsible, a parasitic psychopath.

When remains found in a swamp are identified, friends are stunned; Mindi Kassotis was supposed to have died in a hospital; five months later, police say she was murdered, and focus on her husband, Nick, to unravel how she died twice.

Police find four victims in the smouldering wreckage of an Oklahoma City house fire and one of the victims starred in the hit TV series Cathouse.

Tony believes his mother found happiness with Deputy Dave Rogers, until he sees the truth; when two women are found dead, the illusion shatters, revealing a corrupt cop capable of unimaginable evil.

A woman is found murdered on the Appalachian Trail and her husband is missing, leaving authorities to wonder if he's the killer or another victim, then more bodies begin to appear.

When a woman is found brutally murdered in her home, all signs point to a local troublemaker, then more bodies start piling up, making police realize they may be dealing with a serial killer, who is preying on the town's most vulnerable citizens.

The body of a woman who failed to return from work the night before is found in a churchyard at dawn; police turn to the city's surveillance cameras to catch her killer.

After nursing student Michelle Le vanishes without a trace, police discover footage that shows her car circling the parking lot where she disappeared, but they cannot identify the driver.

In Tempe, Ariz., millionaire entrepreneur Rick Chance is gunned down in a hotel room, prompting detectives to analyze a surveillance video to catch his killer.

After Keith Reed is gunned down on his doorstep, surveillance footage helps police unravel the mystery of who killed him and why.

After a man's savage murder at home, his wife is in the frame after calling 911, but the truth is more macabre than anyone dared believe; a husband finds his wife with shots to the head.

After the brutal binding, torture and murder of a woman in her home, her ex-husband calls 911, but police suspect he is the killer. Also, when a man turns up dead in a house fire, his wife tells police he was suicidal, but the truth is even more shocking.

A mother brutally murdered in her home, the husband and his bizarre alter ego are in the frame after calling 911; a woman is found dead in a creek after a road accident, her husband calls 911 in a panic.

A wife wakes to find her husband dead outside in the snow, she calls 911; when the police discover a volatile history, suspicions are aroused; a man calls police after both his parents are shot dead in their home.

In Wisconsin, Rhinelander PD attempts to foil a murder for hire by going undercover and meeting the suspect as a hit man; in Colorado, law enforcement from two counties try to stop a runaway semi-truck before it damages the little town of Brush.

In Ohio, officers respond when a man brandishes a knife in a store; in Georgia, police launch a manhunt after a suspect escapes in his truck, leaving an officer down.

An undercover agent buying drugs and guns from Florida gangs finds himself at the wrong end of the barrel; a young mom and her kids are about to be swept away by a sudden torrent; a truck plows recklessly through rural Ohio.

An armed robber starts a shootout on a city bus in Maryland; a California police officer races to drag a man from a wheelchair stuck on a train level crossing; in Ohio, officers attempt to rescue a woman trapped inside a raging house fire.

Following a high-speed pursuit, officers dive for cover as a car races through their crime scene; a suspect hides on a dense mangrove island to evade police.

An undercover FBI investigation uncovers a plot to murder lawyers and politicians; in Florida, a man throws himself into alligator-infested waters to evade arrest.

Police break into an apartment to save the lives of two women as their machete-wielding attacker leads officers on a pursuit; in Wisconsin, a winter storm causes a multi vehicle pile-up.

In Connecticut, police hunt down a gunman who has shot at an officer, in Wisconsin, police launch a chase to intercept a driver with stolen plates, and in Florida, Sheriff's K9s are on the trail of a man who viciously assaulted his girlfriend.