Part 2 - Known as the internet's evil twin, the dark web is a place where services offering hit men-for-hire are just a computer click away. "48 Hours" explores the alarming world of murder-for-hire on the mysterious dark web and exposes an international criminal organization in a hunt for a self-described murder mastermind who uses the name Yura. A six-month investigation spans the globe and leads "48 Hours" to information in the U.S. and beyond, about murder plots bought and paid for -- but not yet carried out. Who is Yura? Where is Yura? And can police intervene before someone else gets killed?

The girlfriend of a Hollywood producer is brutally murdered. Was she the victim of the Russian mob, the producer’s love life, or was there something in his graphic novel that held the key?

Ramon Sosa, was a former pro boxer who owned two gyms in Houston, Texas. He was on top of the world — until he learned someone was trying to hire a hit man to kill him. He came out fighting, helping police in an elaborate sting which meant he'd go down for the count in a most unusual way. "48 Hours" correspondent Peter Van Sant goes inside the twisted case of a man whose murder was ordered – and who lived to talk about it.

A father goes hunting in a Florida lake and vanishes. Many people thought he was eaten by alligators, but not his mother. Seventeen years later, a stunning confession proves she was right all along.

A brilliant Ivy League student is murdered after he went to a California park with a former high school classmate. Was he killed because he was gay and Jewish? Correspondent Tracy Smith investigates.

Joey Comunale, a successful 26-year-old from Connecticut did what many young people do every weekend -- go clubbing in New York's hot Meatpacking District. Comunale ended the night at an after-party that seemed like any other ... but this time, he disappeared.

Four years after his death, a family feud erupts over radio legend Casey Kasem, exactly how he died, and who was responsible -- an estate that could be worth $100 million is at stake. "48 Hours" Peter Van Sant reports.

"48 Hours" goes inside a family’s mission to restore their son’s reputation seven years after he was fatally shot by a police officer. CBS News special correspondent James Brown reports.

More than two decades after Iowa TV anchor Jodi Huisentruit disappeared, "48 Hours" reveals new information into the investigation. CBS News' Jim Axelrod reports.

A Texas father targeted by a hit man fights for the life of the person who ordered the murder -- his son. "48 Hours"' Peter Van Sant has the latest in the case.

A look inside the Closs case, the extraordinary stories of other children found, and the heartache of families with children still missing

Can a podcaster and a driven detective using cutting-edge technology solve a stone cold double murder? "48 Hours" correspondent Richard Schlesinger investigates.

Nearly 20 years ago a death row inmate wrote to "48 Hours" that he was framed for the murder of four people. Was evidence planted? New DNA tests could answer that question. Correspondent Erin Moriarty investigates.

"48 Hours" Live to Tell: Hostages chillingly reveal the terrifying three hours they spent held captive by a gunman inside a California supermarket. CBS News' Jim Axelrod reports.

A teenager said after he killed an elderly couple “it felt amazing.” Now a controversial new California law could set him free at 25. "48 Hours" correspondent Erin Moriarty investigates.

A pregnant, South Carolinian mother and her infant daughter are found dead near railway tracks. Though determined to be a suicide, the victims' family suspects their son-in-law.

Peter Van Sant and the team investigate the 30-year-old murder of American teacher Carolyn Abel, who was living in South Korea at the time of her death and whose murderer could avoid going to trial due to a specific loophole in American laws.

After three murders with chillingly similar scenarios occurred in Austin, Texas, police began to wonder if they were chasing a serial killer. But whomever committed the crimes left no evidence, no DNA. Cops went into a frantic investigation. The hunt for clues changed when a man testing out a new thermal imaging scope recorded the nighttime movements of a stranger the night of the first murder. As "48 Hours" correspondent Maureen Maher reports, it was evidence cops never expected – and would help them break the case.

Could a teenager be brainwashed by one parent to help murder the other parent -- and then make it look like a suicide? "48 Hours" correspondent Erin Moriarty investigates.

A Marine colonel is found shot in his bunk. Authorities say it was a suicide, his wife says it was murder -- and she is determined to prove it. "48 Hours" Peter Van Sant investigates.

A judge and her son are ambushed in front of their home. Shot multiple times, the judge refuses to be intimidated and works to stop other attacks. CBS News' Jim Axelrod reports.

An Irish businessman is killed by his American au-pair-turned-wife and her father. They claim self-defense -- the dead man’s sister fights to clear his name. "48 Hours"' Maureen Maher investigates.

A teenager’s death appeared to be a suicide -- but investigators say she was helped by a friend who recorded it and weeks earlier texted “it's like getting away with murder.” CBS News' David Begnaud investigates.

A former TV producer and windsurfing champion says he’s in prison for a murder he didn’t commit -- the only physical evidence against him: a teaspoon of sand. "48 Hours" correspondent Erin Moriarty investigates.

A multimillionaire investor accused of killing his wife and staging a kidnapping scheme leads U.S. Marshals on a global manhunt. Have you seen him? Correspondent Tracy Smith investigates.

A popular teacher is gunned down in a quiet Pennsylvania city. Who would want her dead? Turns out, there might be a few people. "48 Hours" correspondent Erin Moriarty investigates.

CBS News journalists explore the courage of Wisconsin teenager Jayme Closs, held captive for 88 days before escaping, and how she and her community have bonded to help her heal.

Millionaire real estate investor Peter Chadwick and his wife Q.C. vanished from their posh Newport Beach, California, home in the middle of the day. Hours later, Peter called 911 from a gas station near the Mexican border. Hear excerpts of what he had to say.