The bodies of several women began turning up in and around the city of Vienna, Austria. Viennese police turned to the FBI for help.

The reputed boss of the Genovese crime family, Vince Gigante wandered the streets of New York wearing only pajamas and a bathrobe, but the FBI was convinced he was anything but crazy. The FBI helped convict Gigante of murder and murder conspiracy.

The body of an unidentified young woman turned up on a highway in a small Pennsylvania town. Agents persisted to identity the body and to find the killer.

A stranger snatched an eight-year-old girl as she played in her Tucson, Arizona neighborhood. Within hours, a drifter who was out on parole for abducting and molesting children, but he was nowhere to be found and time had run out.

Posing as a fashion photographer, serial killer Christopher Wilder lured young women from shopping malls with promises of fame and fortune. Most ended up dead. national publicity that the FBI created led to the capture of the suspect.

Young women were being abducted from their own front yards in broad daylight. The FBI was determined to put an end to the serial killer's deadly game of cat and mouse.

A couple engaged in a gruesome crime spree that spanned six states and left eight people dead-including children.

Two officers had been shot and one had been murdered in Washington, D.C.. Each had been sitting in their patrol cars when a man sneaked up and opened fire. The FBI was brought in to help catch the cop killer, and this led to a violent gun battle.

Street gangs in Washington D.C. enforced their territories with lethal violence. Authorities vowed to bring the entire gang to justice while the gang leader had fled to Africa.

Police and FBI agents track a serial killer in a cross-country manhunt.

The bodies of several young women began turning up in shallow graves in the Alaskan wilderness. FBI profilers mapped the criminal's mind.

Lured by the easy wealth of the narcotics industry, crooked cops in the New Orleans Police Department began breaking the laws they were sworn to uphold in the early 1990s.

A series of brutal bank robberies and murders led to an exhaustive eight-month investigation by the FBI. What followed was the bloodiest firefight in FBI history.

A woman vanishes, and police suspect that her powerful ex-lover, a married man, was responsible. When investigators can't find the woman's body or the murder weapon, the FBI's only hope was to go undercover and turn brother against brother.

Masked bandits pulled off a daring mid-day bank robbery. With no evidence leaving behind, the FBI forced their own luck.

Glendale, Arizona mall, local authorities and the FBI scrambled to recover its cargo of nearly a million dollars.

A California man was found dismembered. The murder suspect was found six months later when he was caught robbing an Arizona bank and sentenced to life. When he escaped from prison, the FBI led a manhunt for the killer.

In the season 3 finale, Drug gangs terrorized Harlem, New York neighborhoods. After a 10-year-old boy became a victim, the FBI formed a task force called C-11, designed to dismantle the gangs.

A young mother and her two daughters were sexually assaulted and brutally murdered in Anchorage, Alaska. With only one piece of forensic evidence, a wash rag carrying pubic lice with which the killer used to clean himself, the FBI helped convicted the woman's nephew, Kirby Anthoney on all three counts of murders.

Claude Dallas lived the life of a cowboy -- a loner and distrustful of authority. When two game wardens confronted Dallas about his deeds, they were shot and killed. After a massive manhunt , Dallas was captured and convicted, but he escaped prison within months.

A 14-year-old girl ran away from her mother's home and disappeared without a trace. A farmer later discovered the young girl's remains in an Illinois barn.

Marine Captain Shirley Russell disappeared. FBI agents found her husband, himself a former Marine, was acting strangely. The FBI's intense investigation revealed a violent past.

In the 1990s, a gang based in the U.S. Virgin Islands smuggled large amounts of cocaine into mainland America. In an investigation spanning from Georgia to South America, the FBI and DEA were able to identify the leader and bring down the drug ring.

A multiple murder-for-hire plot that was meticulously planned and executed. A mother, her 8-year-old son, and a live-in nurse were brutally murdered by an assassin. the FBI was able to zero in on Larry Horn, the father of the 8-year-old.

Two brothers gained national attention after a videotaped shoot-out with state and local officers in Wilmington, Ohio. The brothers escaped and fled the state.