TV Guide Investigation Discovery Thursday

Toddler Cooper Harris dies after being left in a hot car; his father says it was an accident, while authorities say it was murder; during the trial, Cooper's grieving mother speaks out about what happened to her baby boy and stuns the courtroom.

For 15 years, Heather Robinson thought she knew her life story; but the arrest of a serial killer 500 miles from home would reveal a dark family secret and turn her life upside down.

For 15 years, Heather Robinson thought she knew her life story; but the arrest of a serial killer 500 miles from home reveals a dark family secret and turns her life upside down.

Single mother Latasha Edwards becomes involved with former schoolmate Dammon whose charm hides a possessive and violent nature; after they separate, Dammon's obsession deepens and Latasha must fight to protect her family.

A single mother is stalked by her ex-boyfriend's son for 22 years.

Divorcée Sarah dates a young, handsome pastor who is harboring unholy secrets behind his clean-cut image.

In Winona, Mo., Jason and Stephanie McClurg suffer a series of misfortunes putting their marriage under an enormous amount of pressure, then first responders find Stephanie dead in the couple's trailer.

Lost souls Frank and Angelina Rodriguez appear to have finally found true love; a sudden death leads investigators to uncover a shocking tale.

To most people, teenage sweethearts Steven and Michelle Gibson seem to be happily married; they have four children and live a fun and adventurous life together, but they are harboring a dark secret that will tear the family apart.

Dr. Mark Wangler and his wife, Kathy, appear to be living the American dream, then a cold premeditated execution tears their family apart.

A handsome U.S. Marine lands the woman of his dreams, but the pressures of a long-distance relationship push these newlyweds to the edge.

Corinne Stoudt gets a second chance at love with husband Calvin, then a too-close roommate and a monstrous past turns this second chance into a deadly battleground.

Millionaire aerospace executives Lynn and Manfred Schockner hide a twisted rage that ends in a deadly conspiracy.

Young and in love, Stephanie and Daniel are happily balancing work and play; before long, tensions arise due to disappointment, self-loathing and a mutual affection for the bottle, and, by the final curtain call, only one of them is left standing.

A 24-year-old Texas college student, Jackie Vandagriff, turned up murdered the morning after meeting a man in a bar, raising the question of her death simply because she looked like the killer's ex-girlfriend.

A family of famous circus performers lives on the road, but behind the carnival atmosphere, all is not what it seems; when the patriarch is shot dead, the killer is closer than anyone would believe.

Oklahoma newlywed Rex Harper is shot dead at the wheel of his truck on Main Street in what investigators believe is a professional hit; with no witnesses or clues, detectives must crack the cowboy code of silence to reveal the key to his killing.

A family of famous circus performers lives on the road, but behind the carnival atmosphere, all is not what it seems; when the patriarch is shot dead, the killer is closer than anyone would believe.

Oklahoma newlywed Rex Harper is shot dead at the wheel of his truck on Main Street in what investigators believe is a professional hit; with no witnesses or clues, detectives must crack the cowboy code of silence to reveal the key to his killing.

A 24-year-old Texas college student, Jackie Vandagriff, turned up murdered the morning after meeting a man in a bar, raising the question of her death simply because she looked like the killer's ex-girlfriend.

Two young mothers living hundreds of miles apart vanish under eerily similar circumstances; years pass without a single lead in either case until a Missouri police officer's routine house call uncovers an unlikely suspect.

In Baltimore, a predator stalks young women and strikes when they are alone at night; however, one of the killer's victims will turn out to be his worst enemy.