Watch 48 Hours

Summary is not available.

The investigation into Katlyn's death, which was initially reported as a medical emergency after her 4-year-old daughter found her unresponsive. Evidence soon revealed she had been strangled with phone charging cables in what prosecutors called a "cold-blooded and calculated" attack following a recent breakup.

When Debe Atrops was murdered, her daughter, Rhianna Stephens, was just 8 months old. More than 30 years later, a cold case team from Washington County took a fresh look at the case by talking to witnesses and running new tests on old evidence. The team thought they had enough to prosecute Debe's estranged husband at the time of her murder, Bob Atrops, who is also Stephens' father. Stephens is convinced they have the wrong man - after losing her mother, she fears losing her father too.

A Pennsylvania man claims a freak accident while handling his gun caused the death of his wife, Melissa Rocuba. Bruno Rocuba was not arrested or charged with any crime. Years later, investigators uncover disturbing new evidence that challenges Bruno Rocuba's story, including surveillance audio capturing his wife's final moments. The recording raises haunting questions about what really happened in that bedroom and whether Melissa Rocuba's death was truly an accident. 48 HOURS correspondent Anne-Marie Green reports on the case in "Melissa Rocuba's Final Moments."

When a gravely ill young woman is rushed to the hospital, doctors make a shocking discovery: she has an "astronomical" amount of lead in her body. What begins as a medical mystery quickly becomes a criminal investigation. Hannah Pettey, a young mother from Alabama, suffered debilitating pain and lost more than 45 pounds in the months prior as her health rapidly declined. Investigators focus on the two people she trusted the most as the police work to uncover who was poisoning Hannah, and why. 48 HOURS correspondent Anne-Marie Green reports on the case in "The Gaslighting of Hannah Pettey," which includes Green's multiple interviews with survivor Hannah Pettey and an exclusive interview with the prime suspect in the case, Hannah's husband, Brian Mann.

Did a high school softball coach recruit one of her former players to kill? "48 Hours" correspondent Anne-Marie Green reports

This week's 48 HOURS centers on SURVIVOR contestant Joe Hunter, whose emotional tribute to his late sister Joanna became one of the most talked-about moments of season 48. Joanna's death was officially ruled a suicide, but Joe says she was murdered and has made it his mission to uncover the truth. 48 HOURS correspondent Natalie Morales has the story on what happened to Hunter's sister in this episode, "Joe Hunter's Mission."

Molly Bish was just 16 years old when she went missing on June 27, 2000. She vanished after being dropped off at her lifeguarding job. What followed became the largest search in Massachusetts history. Her remains were eventually discovered, but her killer has never been identified. Decades later, Bish's sister turns to social media, sharing her family's story and urging the public to help generate new leads. 48 HOURS correspondent Erin Moriarty reports on the renewed push for answers.

A stalker sends menacing messages to a young mother before she is murdered. The investigation reveals a sinister setup. In this week's 48 HOURS, correspondent Peter Van Sant reports on how law enforcement unraveled the case, including why a person of interest believes the spirit of the victim gave him "the urge" to buy a sweatshirt that ultimately helped clear his name.

When a young mother goes missing, trained tracker and detective Dakota Black launches an investigation that locates the murdered woman.

The murders of a beloved doctor, his wife and their young daughter leave their Santa Barbara, Calif., community reeling; a manhunt leads to the arrest of a suspect who prosecutors say is a conman.

A gifted artist is murdered in her home; decades later, her killer reveals what drove him. Her toddler is left at the crime scene to fend for herself.

A young woman mourns her uncle's murder and questions whether the convicted killer was the only one involved.

After her husband is found with a fatal injury at the foot of the stairs, a woman is accused of murder and fights to clear her name. Alison Davis says she woke up to find her husband, Kevin, critically injured, and she insists he fell down the stairs. But police say an autopsy revealed inconsistencies that led them to a different conclusion. Alison Davis always maintained her innocence and was in the fight of her life to defend herself.

A wife calls 911 to report her husband missing. Police then discover his lifeless body in his car, parked inside a corporate parking garage. The first clues to solving the mystery come from the very cameras the killer tried to cover up. Security footage shows a masked man in a yellow hard hat carrying a can of blue spray paint, attempting to conceal his crime.

48 HOURS launches its 38th season with the case of 17-year-old Benjamin Elliott, who stabbed his twin sister - a crime with no known motive. His defense team says he was sleepwalking when he killed her.