Marti Hill did not show up for work one day in September 2010, and her co-workers grew concerned. Police were summoned after Hill’s boss drove to her home and found her car still in the driveway. She was found by police, at the bottom of the basement steps, barely breathing and covered in blood. Hill’s mother alerted police towards Brian Pennington, a construction worker whom both she and Marti had hired to do work. This classic "48 Hours" episode last aired on 12/28/2013. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

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On September 4, 2006, Kathy Wangler, wife of anesthesiologist Dr. Mark Wangler, died from carbon monoxide poisoning in their home in Lima, Ohio. Their thirty-year marriage had been falling apart; three years later, in 2009, investigators came to the conclusion that Dr. Wangler had murdered his wife. Kathy’s mother and sisters felt that since Mark was familiar with gasses that he was able to plan and execute the perfect murder. Mark was arrested and the case was brought to trial. “48 Hours" correspondent Peter Van Sant reports. This classic "48 Hours" episode last aired on 6/16/2012. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

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A report on the September 3, 2006 disappearance of Nina Reiser, a Russian doctor who had married Hans Reiser. The couple had two children, but their marriage began to fall apart and Nina began an affair with Sean Sturgeon, Hans’ best friend. Embroiled in a nasty custody fight, Nina dropped off the children at Hans’ house on Labor Day weekend and then mysteriously vanished. “48 Hours" correspondent Maureen Maher reports. This classic "48 Hours" episode last aired on 7/18/2009. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

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How a yellow hammer nailed a suspect in the case of a missing businesswoman. Peter Van Sant reports.

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When a woman vanishes and misses a hair appointment, her hairdresser becomes the driving force to find out -- did she leave her husband or is she dead? Peter Van Sant reports.

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Three Texas housewives, Tammye Markle, Joni Shannon and Tina Wiley, used the internet to try to find their friend Lisa Stone, who disappeared from her Dallas home in June 2010. The four women kept in touch with each other via Facebook, but her friends became worried when she abruptly stopped posting. One evening Joni noticed Sherry Henry, Lisa's former partner, throw Lisa's belongings into a dumpster. The police confronted Sherry, who insisted that she did not know where Lisa was. Homicide detective Jim Gallagher believes that Lisa Stone is dead. “48 Hours" correspondent Maureen Maher reports. This classic "48 Hours" episode last aired on 6/5/2012. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

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When his parents disappear, Chandler Halderson’s social media helps investigators unravel the case. Erin Moriarty reports.

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Inside the mind of murderer Mark Twitchell. Letters from the man police say wanted to be like fictional serial killer Dexter. Troy Roberts reports.

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A further examination of the story of Laura Hall, who was convicted and sent to prison for the crime of dismembering the body of Jennifer Cave in 2005. Laura admitted to going to the apartment of her boyfriend Colton Pitonyak, at his request, and was confronted with the body of Cave. Put on trial for this crime, and for helping Pitonyak escape, she was found guilty and sentenced to five years in prison. However, after 17 months in jail, Laura Hall was released. Her conviction was upheld and she was out on bond while prosecutors fought to put her back in jail. Pitonyak’s new lawyer said that they had new evidence and that Hall was also responsible for the murder, which she denies. “48 Hours" correspondent Maureen Maher reports. This classic "48 Hours" episode last aired on 7/2/2011. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

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A frantic 911 call captures the sound of a gunshot as a couple reports a break-in. How did the intruder disappear? Jamie Yuccas reports.

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When a man goes missing, his friends turn to social media to track his final hours. What they learn is horrific. Erin Moriarty reports.

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