When Marty Tankleff was convicted for murdering his parents in 1990, some people still had their doubts about his guilt, including Jay Salpeter, a retired detective turned private investigator. Jay found a new witness who claimed he was the getaway driver for two hitmen who had been hired to murder the Tankleffs. After nearly two decades behind bars, Marty finally got another shot at freedom. In this season finale, Erin Moriarty and retired 48 Hours producer Gail Zimmerman discuss the conclusion of Marty Tankleff's wrongful conviction case and why it's one of the most memorable stories they've ever reported.

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On September 6, 1988, a wealthy couple, Seymour and Arlene Tankleff, were brutally attacked and killed in their home on Long Island, New York. The main suspect was their 17-year-old son, Marty, who was the sole survivor in the house. Detective James McCready was convinced Marty was to blame and prepared a written statement for him to admit he killed his parents. But the physical evidence at the crime scene didn't match the murder weapons described in Marty's so-called confession. Erin Moriarty and retired 48 Hours producer Gail Zimmerman go behind the scenes on a case that spanned nearly two decades and was one of the first wrongful conviction stories they worked on.

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A retired attorney in California revolutionized the field of crime fighting — all from her home. Barbara Rae-Venter identified the notorious Golden State Killer as Joseph James DeAngelo thanks to investigative genetic genealogy, a technique using DNA to build the family tree of the killer. Barbara recalls how a hobby turned into an unexpected career and how her work has been able to help other cold case victims finally find justice with the help of genetic genealogy.

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Jim Krauseneck's first wife, Cathy, was found dead in 1982 with an ax in her head. 40 years later, Jim was accused of her murder. One of the coldest cases in the country to go on trial took decades to solve... and tore apart a family. Erin Moriarty goes behind-the-scenes of Jim's trial, from Dr. Michael Baden's opinion on the estimated time of death to fourth wife Sharon Krauseneck's steadfast faith in her husband. Eventually, Jim's fate came down to key details about what occurred that night. Erin takes you deeper into the "48 Hours" investigation, "The Brighton Axe Murder".

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Sometimes the person you love isn't who you think they are. Sharon Krauseneck says she and her husband Jim were happily married. But in 2016, to Sharon's surprise, her husband's alleged dark past caught up to him. In 1982, Jim's first wife, Cathy, was murdered with an ax lodged in her head. The case went cold until a well-known forensic pathologist shed new light on crucial evidence 34 years later. Erin takes you deeper into the "48 Hours" investigation, "The Brighton Axe Murder".

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On September 13th, 2006, a woman's body was found floating in Newport Beach Harbor in California. It was 56-year-old Barbara Mullenix, who had been stabbed more than 50 times--a sign detectives said meant she likely knew her killer. Detectives at first looked at her ex-husband Bruce, but soon moved their focus to her daughter Rachael and her boyfriend Ian Allen, as the evidence led investigators to an unthinkable conclusion. Erin takes you deeper into the "48 Hours" investigation, "Lady in the Harbor".

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In 2021, Wisconsin native Chandler Halderson reported that his parents, Bart and Krista, went missing after the July 4th holiday weekend. A week later, authorities found their dismembered remains, and information from his girlfriend's Snapchat account linked Chandler's location to one of the murders. But why would a son be driven to such lengths to kill his parents? Erin Moriarty dives into the secrets Chandler was hiding leading up to the murders, and the bizarre jailhouse texts between him and his girlfriend, in the conclusion of the "48 Hours" investigation, "The Snapchat Clue".

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How far are some people willing to go to keep a secret? In 2021, Chandler Halderson told police that his parents, Bart and Krista, were missing after a trip to their family cabin north of Windsor, Wisconsin for the Fourth of July holiday weekend. But Chandler became a prime suspect after lying about his activities in the days leading up to the holiday. Police then got a final break in the case from Chandler's girlfriend, whose account on the popular social media app, Snapchat, tracked Chandler’s location to a remote spot along the Wisconsin River during the time of his parent’s disappearance. When deputies searched the area, they made a gruesome discovery. Erin Moriarty takes you even deeper into the "48 Hours" investigation, "The Snapchat Clue".

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In November 2012, Daniel DeWild was on trial for murdering his ex-wife, Heather. With the help of his twin brother, David DeWild, they thought they could commit the perfect crime if they kept their mouths shut. But what happens when one twin turns on the other? Who will the jury believe? Erin continues the investigation and examines the research that went into Heather’s homicide, a torn jury’s considerations, and defense attorney Tom Ward’s suggestions that David, not Daniel, may be the twin to blame. Erin Moriarty takes you deeper into the conclusion of the "48 Hours" investigation, "The Devil's Twin".

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In July of 2003, 30-year-old Heather DeWild vanished after visiting her soon-to-be ex-husband Daniel DeWild's home. From the beginning, Heather's family suspected Daniel of harming her, especially when they learned he was angry about having to pay child support for his and Heather's two children. Investigators soon focused not only on Daniel, but also his identical twin brother, David. While Daniel was not forthcoming, investigators were convinced David had something to say, but could police break through their tight twin bond? What could cause a person, or persons, to destroy their family? Erin Moriarty takes you even deeper into the "48 Hours" investigation, "The Devil's Twin".

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"48 Hours'' correspondent Erin Moriarty is exploring some of the most baffling crimes: those that occur within families. From a teenager convicted of murdering her own mother, to a husband who said he discovered his wife with an ax in her head, Erin is taking a closer look at the secrets that can tear families apart. Follow along Erin's journey as she delves deeper into each case, and sometimes, even into the killers' inner thoughts. With almost three decades of experience as a lawyer and reporter investigating murder cases, Moriarty carefully examines the evidence and talks to the people directly involved, including law enforcement and the families of victims. It's all on season 4 of "My Life of Crime". New episodes every Wednesday.

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