Chilling new details about alleged killer Rex Heuermann.

New information about the case against Bryan Kohberger for the Nov. 13, 2022, deaths of four University of Idaho students.

Tim Bliefnick, a former contestant on the game show "Family Feud," was arrested, charged and convicted for the February 2023 murder of his estranged wife, Becky Bliefnick. Now, in his first TV interview after a jury found him guilty. Becky Bliefnick was found dead in her Quincy, Ill., home. She was shot multiple times. The case generated media attention when it was revealed that nearly two years before the couple separated, Tim Bliefnick appeared on "Family Feud." During the show, host Steve Harvey said to Bliefnick, "All right, Tim, we talked to 100 married people. What's the biggest mistake you made at your wedding?

A crime scene investigator is gunned down in broad daylight. The harrowing scene is captured on surveillance video. Who pulled the trigger? "48 Hours" correspondent Erin Moriarty reports.

It was New Year's Day 2021 when the San Diego Sheriff's Department got a call from a man saying his friend, an area woman named Jade Janks, might have killed her stepfather, Tom Merriman. In a story only on 48 HOURS.

Angela Brosso, 21, and Melanie Bernas, 17, were separately killed while riding their bikes along the Phoenix Canal.

These murders became widely known as the Phoenix Canal Murders," says Briana Whitney, the true-crime reporter for CBS affiliate KPHO-TV in Phoenix.

Investigators got a break 21 years after the murders when, thanks to DNA and genetic genealogy, they zeroed in on 42-year-old Bryan Patrick Miller, a divorced father raising his teenage daughter. Investigators soon found out that Miller had an alter ego. He was a local celebrity known for participating in parades and festivals as the "Zombie Hunter," a zombie-slaying comic book hero armed with a larger-than-life Gatling gun.

Detectives just needed a sample of Miller's DNA to make the case or eliminate him as a suspect. That quest took them to a local Chili's.

Marlene Warren answered the door of her Florida home on May 26, 1990, to find a clown handing her balloons and flowers. In an instant, she was shot dead while her 21-year-old son looked on. Warren's son, Joe Aherns, opens up.

The clown then calmly walked back to their car and drove away.

On Dec. 14, 1991, 16-year-old honor student Sarah Yarborough was on her way to drill team practice at Federal Way High School outside Seattle, Wash. She never made it. She was found murdered just a hundred yards away from her car on the school's campus. Correspondent Natalie Morales speaks to key people who were involved in bringing Yarborough's killer to justice, including the first television interviews with Sarah's family and friends, and a woman who had been attacked by the same man years earlier.

Years before South Carolina legal scion Alex Murdaugh was convicted for the murders of his wife and son, there was another mystery in Murdaugh country – the death of Stephen Smith, a 19-year-old gay man. After his body was found on a country road on July 8, 2015, the medical examiner ruled it a hit and run. For years, his mother Sandy Smith wanted a second opinion. Now, 48 HOURS reports on a new investigation into the case. Early on, rumors that the Murdaughs were somehow involved in Smith's death spread through town. The Murdaugh name comes up dozens of times in the case file. The investigation seemingly went nowhere, and no suspects were named in Smith's death. In late 2016, the case went cold. It was reignited in June 2021 after the murders of Paul and Maggie Murdaugh. During that investigation, the South Carolina Law Enforcement Division (SLED) announced it had uncovered a new lead in Smith's death and would be taking over the case. But it has not said what that evidence is.

At 6:30 in the morning of April 25, 2010, Heidi Firkus called 911 after her husband, Nick Firkus, said an intruder was breaking into their home. She was shot and killed and Nick Firkus told investigators that his gun discharged when he struggled with the intruder.

Millionaire business owner Andreen McDonald was known for her strict workout regimen. On the morning of March 1, 2019, when she didn't show up for work, her employees called the gym, which was her usual first stop in her morning routine. They found out she never showed up there either, which raised red flags. What happened to the businesswoman, wife and mother?

In the early morning of Sept. 22, 2020, police officer Gregorio De La Cruz responded to a call at a home in Laredo, Texas. At the top of the stairs of the house, Joel Pellot, dressed in surgical scrubs, was performing CPR on his wife, Maria Muñoz. Paramedics and police jumped in to help, but at 3:58 AM, less than three hours after Joel Pellot had called 9-1-1, 31-year-old Maria Muñoz was declared dead inside their home. Was Maria's death a suicide, an accident or a murder? Authorities turned to her journals for help.

On June 28, 2014, in the small town of Cottonport, La., 29-year-old Megan Parra was discovered in her home by her parents, Missy and Steve Ducote, with a gunshot wound to her head. Parra's husband, Dustin Parra, showed up minutes later and tried to save her. It was too late. She was taken off life support the next day. Her death was ruled a suicide, but Steve Ducote was convinced there was foul play.

On March 2, 2018, intruders entered the home of wealthy jewelers Ted and Corey Shaughnessy in Austin, Texas. A gunfight left 55-year-old Ted Shaughnessy dead. Investigators at first wondered if it was a random attack, a robbery gone wrong or a targeted assassination.

Cayley Mandadi was a 19-year-old sophomore at Trinity University when she arrived at a hospital in Texas on Oct. 29, 2017. She was nearly naked, bruised and not breathing. Her sometime boyfriend Mark Howerton told doctors they'd taken ecstasy at a music festival and she passed out after consensual sex in his car. She died at the hospital. Mandadi's mother and stepfather believed something far more sinister had happened and set out to prove it.

Before Kaitlin Armstrong was found guilty of killing professional gravel cyclist Anna Moriah "Mo" Wilson, she was on the run in Costa Rica from the murder charge.

But when investigators went to look for her, she was nowhere to be found. The Lone Star Fugitive Task Force got the job of tracking her down. They suspected Armstrong had flown to Costa Rica on May 18, 2022. There, she tried to hide her identity by using other names, Beth and Ari, and she cut and dyed her hair.

"48 Hours" contributor Jonathan Vigliotti has the first interview with members of the task force in "Capturing Moriah Wilson's Killer."

When Ray Wright, 55, suddenly lost contact with his family, they knew something was wrong. Two days later, his brother confronted an intruder in Ray Wright's home. What happened to Wright was a mystery. Then, 16 days after Ray Wright vanished, a high-speed chase gave police clues to what happened.

It's been almost four years since prominent L.A. therapist Amie Harwick was murdered on Feb. 15, 2020. For the first time, the man who tried to save her opens up about what happened.

Las Vegas Review-Journal investigative reporter Jeff German was a local legend–renowned for his reporting on infamous mobsters, crooked politicians and murderers. But in September 2022, it was the reporter making headlines. German was ambushed and stabbed to death by an unknown assailant outside his home.

In the early morning hours of March 4, 2022, Kouri Richins says she found her husband, Eric Richins, unresponsive in their bed. First responders tried to save him, but it was too late for the father of three. Weeks later, police said Richins' death was caused by an overdose of fentanyl. The grieving widow from Utah was arrested and charged with murder shortly after she wrote a children's book to help their kids cope with grief.

Lyle and Erik Menendez have already spent nearly 34 years behind bars for gunning down their parents in 1989. Now they're awaiting a judge's decision on whether new evidence can support their claim that they killed in self-defense and should have been convicted of manslaughter instead of murder. Lyle Menendez gives his side of the story.

Well-known beauty executive Fabio Sementilli was sitting by his swimming pool when he was brutally stabbed to death. His body was discovered by his then 16-year-old daughter Isabella on Jan. 23, 2017. Prosecutors say his wife, Monica Sementilli, was secretly having an affair with racquetball instructor Robert Baker. Baker defends Monica Sementilli.

Lamar Johnson was 21 in 1995 when he was charged with the murder of a friend, Markus Boyd. Johnson said he was several miles away with his girlfriend and daughter, but he was convicted and sentenced to life in prison primarily based on the testimony of Greg Elking, who picked Johnson out of a police lineup. Nearly three decades later, Johnson's conviction was vacated after Elking recanted his identification of Johnson. Now, Johnson tells the story of his fight to prove his innocence and Elking explains why he lied at Johnson's trial.

James Craig was a well-known dentist, who with his wife Angela Craig, was raising six children in Aurora, Colo. But on March 6, 2023, Angela Craig reported feeling sick and her husband took her to the hospital. Doctors could not determine why Angela was so sick. Two hectic weeks later, after being put on life support, Angela Craig was dead. Her autopsy revealed she had been poisoned and police claim the evidence pointed to her husband.

In 2001, a California mother and wife, Jane Dorotik, was convicted of murdering her husband but always maintained her innocence. From prison, Dorotik spent years filing motions asking for new testing of evidence, which was eventually done. Dorotik and her legal team say they discovered serious problems with some of that evidence.

On May 24, 2019, Jennifer Farber Dulos dropped off her five children at school, drove to her Connecticut home, and was never seen again. Dulos' estranged husband, Fotis Dulos, was charged with her murder, but after he died by suicide the focus turned to his girlfriend, Michelle Troconis. On March 1, 2024, Troconis was found guilty of conspiring with Fotis Dulos to murder Jennifer Dulos and covering it up.

When a 26-year-old mother of two, Madeline "Maddi" Kingsbury, from Winona, Minn., went missing, her distraught sister headed to TikTok and pleaded with the public to help find her. For 68 days, Megan Kingsbury documented her sister's disappearance.

In October 2023, Jessy Kurczewski went on trial for the intentional homicide of Lynn Hernan, along with two counts of felony theft for stealing from Hernan. Five years earlier, Kurczewski called the police and told them she found Hernan dead, sitting in her recliner, in the living room of her Pewaukee, Wis., condo. Kurczewski told investigators she had been helping take care of her friend, who had been struggling with health problems. Almost three years later, she was charged with poisoning that friend with eye drops.

In the early morning hours of Halloween 2019 in Hays, Kansas, Colby Trickle called 911 and said he woke up to his ears ringing and saw his wife, Kristen Trickle, bleeding next to him in the bed. Responding officers found Kristen Trickle, 26, clinging to life. What happened was a mystery.

On May 8, 2018, detective Brian Fanion dialed 911. When Massachusetts State Police detectives Brendan O'Toole and Mike Blanchette arrived at the scene, they found 51-year-old Amy Fanion dead on the dining room floor. According to Brian Fanion, the couple had been arguing about his retirement plans, and at some point, Amy Fanion picked up his service weapon and shot herself. Investigators did not believe his story.

Nicki Myers Bates was just 7 years old in 2006 when her mother vanished and the man her mom lived with told police he watched her die. That man, William Greer, went on the run, evading authorities for years. Nearly two decades later, Bates is still desperately trying to find her mother's remains.

Help solve a murder case: a former model brutally killed in her Georgia home. Someone out there knows something, is it you? "48 Hours" correspondent Erin Moriarty investigates.