10 Unsolved Cold Cases That Continue to Haunt the FBI
Picture a manila folder gathering dust in an evidence room, marked with decades-old fingerprints and containing questions that still echo through the halls of FBI headquarters. The truth is unsettling: nearly 346,000 cases of homicide and non-negligent manslaughter went unsolved from 1965 to 2023, according to the FBI’s Uniform Crime Report data studied by The Murder Accountability Project. These aren’t just numbers in a database. They’re lives interrupted, families shattered, and mysteries that keep investigators awake at night.
Some cases become cultural touchstones, embedded in our collective consciousness through documentaries and endless speculation. Yet the agents who work these files know something the public often forgets: solving a cold case in 2026 is both harder and easier than ever before. DNA technology that didn’t exist decades ago now offers hope, while the passage of time has claimed witnesses and destroyed evidence. Let’s dive into ten investigations that refuse to fade away.
The Zodiac Killer: California’s Cryptic Phantom
The Zodiac Killer is believed to be responsible for at least five murders in Northern California between 1968 and 1969, though he claimed to have killed as many as 37. What makes this case particularly maddening for investigators is how the killer taunted authorities with encrypted messages, some still unsolved after more than half a century. As of 2025, the decades-old case remains open, with law enforcement actively using forensic genetic genealogy and advanced DNA technology to analyze evidence from his taunting letters and cryptic ciphers.
Recent developments have reignited interest. A bombshell investigation claims to have solved the case, with investigative consultant Alex Baber believing he has finally solved both the Zodiac and Black Dahlia cases using artificial intelligence, newly released census records and classic cryptography. The FBI and California police departments are reviewing Baber’s claims, though many remain skeptical after decades of false leads.
D.B. Cooper: The Skyjacker Who Vanished Into Thin Air
On a stormy November night in 1971, a man who called himself Dan Cooper pulled off what remains the only unsolved hijacking in American aviation history. After taking off from Seattle, Cooper opened the aircraft’s aft door, deployed the airstair, and parachuted to an uncertain fate over a remote, heavily wooded area of Southwest Washington. Because of a reporter’s error, the hijacker became known as D.B. Cooper.
Despite years of investigation, the FBI closed the D.B. Cooper case in 2016, leaving it officially unsolved. Here’s where it gets interesting though: YouTuber Dan Gryder found a modified parachute on a North Carolina property in 2022, and he and McCoy’s son traveled to Richmond, Virginia, in September 2023, where FBI agents took the parachute, a harness and a skydiving logbook into evidence. Could the mystery finally be solved? Many experts remain divided.
Jimmy Hoffa: The Union Boss Who Walked Into Oblivion
Today marks 50 years since the disappearance of James “Jimmy” Hoffa, a case which remains one of the most well-known missing person investigations in FBI history. The powerful Teamsters president vanished from a suburban Detroit restaurant parking lot in 1975, supposedly on his way to meet mob figures who never showed. His car was found abandoned, but Hoffa himself seemed to have evaporated.
Theories about his final resting place have become almost comical in their variety. To this day, the consensus among informed federal agents and mob-ologists is that Hoffa was killed in Detroit and his corpse quickly dissolved in an acid vat, never to be found. Yet tips keep coming. New evidence suggests he might actually be in Wisconsin, underneath a major baseball field, with The Case Breakers asking the FBI to begin searching under a parking lot next to the Brewers’ stadium.
The 2001 Anthrax Attacks: America’s Deadliest Bioterror
The 2001 anthrax attacks occurred in the United States over the course of several weeks beginning on September 18, 2001, one week after the September 11 attacks. Letters containing anthrax spores were mailed to several news media offices and to senators Tom Daschle and Patrick Leahy, killing five people and infecting seventeen others.
The FBI officially closed the case in 2010, naming Army scientist Bruce Ivins as the sole perpetrator. Trouble is, not everyone buys it. A National Academy of Sciences report cast doubt on the government’s conclusion that Ivins was the perpetrator, finding that the type of anthrax used in the letters was correctly identified as the Ames strain of the bacterium, but that there was insufficient scientific evidence for the FBI’s assertion that it originated from Ivins’ laboratory. Ivins committed suicide before he could be charged, leaving questions that may never be answered.
Missing and Murdered Indigenous Women: A Crisis in Indian Country
This isn’t one case but thousands, representing a humanitarian crisis that the FBI has only recently begun addressing with the resources it deserves. At the beginning of Fiscal Year 2025, FBI’s Indian Country program had approximately 4,300 open investigations, including over 900 death investigations, 1,000 child abuse investigations, and more than 500 domestic violence and adult sexual abuse investigations.
There are at least 4,300 cases of unsolved violent crimes against Native Americans across the country. The geographic isolation of many tribal lands, jurisdictional complexities, and historical underfunding have created a perfect storm where perpetrators often escape justice. Recent initiatives like Operation Not Forgotten have surged FBI resources to these communities, but decades of neglect won’t be reversed overnight.
The Tylenol Murders: When Medicine Became Murder Weapon
In 1982, seven people in the Chicago area died after taking Extra-Strength Tylenol capsules that had been poisoned with cyanide. The FBI has spent years investigating this public health crime, yet it has not made a single arrest. Someone purchased bottles of Tylenol, laced them with lethal doses of cyanide, and returned them to store shelves where unsuspecting victims bought them.
The randomness makes it terrifying. These weren’t targeted hits but indiscriminate killings that changed how we package over-the-counter medications forever. Yet despite thousands of tips and extensive investigations, the person responsible was never identified. The case remains technically open, though leads dried up decades ago.
The Atlanta Child Murders: Doubts That Never Disappeared
Between 1979 and 1981, at least 28 African American children and young adults were murdered in Atlanta. Wayne Williams was convicted in 1982 for two of the adult murders, and police closed the other cases, attributing them to Williams as well. But here’s what keeps this case on the FBI’s radar: many investigators, family members, and journalists have never believed Williams was responsible for all the killings.
New DNA testing and re-examination of evidence in recent years have raised more questions than answers. Some victims’ families insist the real killer or killers were never caught, and that closing the cases was more about political pressure than actual evidence. The wounds in Atlanta’s communities have never fully healed.
The Disappearance of Asha Degree: The Girl Who Walked Into Darkness
On Valentine’s Day 2000, nine-year-old Asha Degree left her North Carolina home in the middle of a stormy night and walked along a highway. Witnesses spotted her, but when they tried to help, she ran into the woods. She hasn’t been seen since. This case defies logical explanation. Why would a shy, well-adjusted child leave her home at 3 a.m. in terrible weather?
Her backpack was found buried miles away, wrapped in plastic. Someone knows what happened to Asha, but more than two decades later, that person hasn’t talked. The FBI continues to investigate, and the billboards asking for information still dot North Carolina highways. Her family has never stopped searching.
The Colonial Parkway Murders: A Killer’s Hunting Ground
Between 1986 and 1989, at least eight people were killed in Virginia along the scenic Colonial Parkway or nearby. Four couples were targeted in their vehicles, leading investigators to suspect a serial killer. The brutality varied, the crime scenes were meticulously controlled, and then suddenly the murders stopped.
Did the killer die? Move away? Get arrested for something else? Despite FBI involvement and advances in forensic technology, these murders remain unsolved. The families have formed advocacy groups, pushing for renewed investigation. Some evidence from the original investigation has been lost or contaminated over the years, making modern analysis impossible.
The Murder of Elizabeth Barraza: Killed in Her Own Driveway
In January 2019, Elizabeth Barraza was setting up a garage sale in her Tomball, Texas driveway when someone in a truck pulled up, shot her multiple times, and drove away. The entire attack was captured on surveillance video, yet the killer remains unidentified. You can see the figure approach, shoot, and leave. The footage is haunting in its clarity and frustrating in its lack of definitive answers.
The FBI joined the investigation because of its bizarre nature and the possibility of interstate elements. Who kills someone so brazenly in broad daylight? The video shows what appears to be a brief conversation before shots are fired, suggesting Elizabeth may have known her killer. Despite thousands of tips and widespread media coverage, no arrests have been made.
