10 Horrific Crimes That Were Solved Thanks to OTHER Criminals

10 Horrific Crimes That Were Solved Thanks to Other Criminals

Welcome to WatchMojo, and today we’re delving into chilling crimes that were solved with the help of other criminals.

Conviction of John Gotti

In 1985, John Gotti orchestrated the murder of Paul Castellano, which cleared his path to becoming the boss of the Gambino crime family. Like most mafia bosses, he thrived on loansharking, racketeering, extortion, approving, and ordering multiple murders. Yet for years, Gotti managed to beat major cases, earning him the nickname “The Teflon Don.” That changed in 1991 when his underboss, Salvatore Gravano, flipped and testified against him. Get this, Gravano wasn’t just any soldier. He was a prominent hitman for the Gambino family. After hearing FBI wiretaps of Gotti blaming him for murders and positioning him as responsible, Gravano broke his oath. Thanks to his help, Gotti was convicted in 1992 and sentenced to life without parole.

Frank Calabrese Sr. Murders

It’s one thing to be betrayed by a business associate, and another to be undone by your own son. That’s how the downfall of Frank Calabrese Sr. unfolded. His relationship with Frank Calabrese Jr. was violent and deeply fractured. While serving time in prison, Calabrese Jr. secretly wrote letters to the FBI, outlining his father’s crimes and his willingness to cooperate. These letters became the spark of what became known as “Operation Family Secrets.” Wearing a wire, Calabrese Jr. captured his father boasting about his past crimes. To make the betrayal worse, Calabrese Sr.’s brother, Nick, also testified against him. As a result, long-unsolved Chicago murders of 1970-80 were closed, many were indicted, and Calabrese Sr. was locked up for life.

Lucchese Crime Family’s Shady Dealings

Remember Ray Liotta’s character in “Goodfellas” who flips after realising he was marked for death? Yep, that closely mirrors Henry Hill’s real-life story. Though Hill wasn’t a made man, he ran with powerful and dangerous figures in the Lucchese crime family. These men were responsible for drug trafficking, extortion, hijackings, and multiple violent murders. Hill was far from a bystander. In 1980, after Hill was arrested on drug charges, he made the critical decision to cooperate. By then, Jimmy Burke had started killing off associates, and Hill believed he was next. Acting out of survival, he testified against Paul Vario and Burke. The same survival instinct surfaced in Frank Lucas’s case, whose cooperation exposed not only organized crime, but deeply corrupt law enforcement.

The Winter Hill Gang Murders

When we say the Winter Hill Gang was dangerous, we mean every word. Its undisputed leader, Whitey Bulger, led a crew where murder was routine, strategic, and relentless. When Bulger was to be indicted in 1994, his FBI handler, John Connolly, tipped him off. That warning allowed him to disappear, and for years, he remained one of America’s most wanted fugitives. After his capture in 2011, former gang members helped ensure he faced justice. John Martorano personally testified that he carried out multiple murders on the orders of Bulger, while Kevin Weeks and other former allies also cooperated. The result? Bulger was convicted in 2013 of eleven murders and sentenced to life in prison, where he was later killed in 2018.

Australia's Snowtown Murders

For very sick reasons, John Bunting and his accomplices murdered at least eleven people between 1992 and 1999. Shockingly, some victims were relatives of these killers. They were sometimes tortured and murdered, with what remained stored in barrels in a disused bank vault in Snowtown. Investigators stumbled upon the first bodies while investigating the disappearance of Elizabeth Haydon, which eventually led them to Bunting and his gang. He was quickly arrested, and all thanks to Bunting’s accomplice, James Vlassakis, it was easy to earn a conviction against him. Vlassakis provided details about the inner workings of the murders and exposed Bunting as the ringleader. He received a reduced sentence as a result and became eligible for parole in 2025.

The Green River Murders

While on death row, Ted Bundy provided insights that helped investigators understand the inner workings of serial killers. One case in particular, the Green River Killings, had long haunted the police. Gary Ridgway would later be convicted of murdering almost fifty women, crimes he committed for years without detection. With no substantial leads, investigators interviewed Bundy, who described the type of killer they were dealing with and how he operated. While DNA was the decisive factor in capturing Ridway, Bundy’s insight helped investigators focus on someone familiar with the Washington area. Well, several years later, Ridgway was eventually caught and made to answer for his horrific crimes.

Murder of Shelly Boggio

This one’s really tricky. In 1985, Shelly Boggio was murdered. Two men, James Dailey and Jack Pearcy, were convicted. While Pearcy received a life sentence, Dailey has been on death row for over 30 years. The thing is, there was no physical evidence tying him to the crime, and investigators relied on three jailhouse informants like Paul Skalnik to convict him. According to them, Dailey had shared graphic details of the murder. Even Pearcy himself confessed that Dailey committed the crime, though he sometimes said he acted alone. Over the years, these inconsistent statements and unreliable testimonies have left the truth unclear. Dailey has repeatedly maintained his innocence, but courts have consistently ruled against his claims.

Ken & Barbie Murders

Between the late 1980s and early 1990s, Paul Bernardo committed some of the most heinous crimes in Ontario. His accomplice and fiancée turned spouse, Karla Homolka, ultimately became his undoing. After a domestic assault, Homolka confided in her aunt and uncle that Bernardo was the infamous Schoolgirl Killer. She then began working secretly with a lawyer to connect Bernardo to the murders of her sister and two other victims. Homolka also helped prosecutors uncover videotapes of Bernardo’s assaults, which became crucial evidence. With her cooperation, investigators reopened the case, re-examined DNA, and were able to tie Bernado to his string of crimes. After striking a plea bargain, Homolka also testified against Bernardo, ensuring he finally answered for his crimes.

The Hillside Stranglers’ Murders

Kenneth Bianchi and his cousin Angelo Buono Jr., were truly horrific, and the way they operated made them especially terrifying. They posed as police officers, using badges and authority to lure women to Bianchi’s car, before assaulting and strangling them. Their crimes became known as the Hillside Stranglers murders in late 1970s Los Angeles. Bianchi was eventually arrested in January 1979, and rather than go down alone, he named Buono as his accomplice. Buono was arguably worse, never admitting his crimes and showing no remorse. For a reduced sentence, Bianchi testified against his awful cousin. Even though his statements were often self-serving and contradictory, it was enough to help put Buono where he truly belonged.

Dean Corll Murders

Elmer Wayne Henley spent years helping Dean Corll lure, restrain, and kill minors in Houston—until he reached his breaking point. In August 1973, during a heated argument, that was when Henley realized Corll had planned to kill him next. After convincing Corll to back down, Henley shot him, ending his murders on the spot. He then immediately called the police, confessed everything, and even led them to the mass burial sites. Without that confession, many victims were likely never to have been found, and Corll’s crimes might have largely remained unknown. Corll’s other accomplice, David Brooks, also later admitted to the full extent of his own role. Despite their cooperation, both criminals were convicted of their crimes.

Which of these crimes horrified you the most? Let us know in the comments.