Nothing rocks a community or captivates a mystery lover like an unsolved crime. And these cold cases have remained open for years, decades even...
James R. Hoffa, then Vice-President of the Teamsters Union, testifies 20 August 1957 in Washington DC before the Senate Rackets Committee. His son, Jimmy Hoffa Jr. was elected 06 December President of the 1. 4 million-strong International Brotherhood of Teamsters labor confederation. His father, the legendary James R. Hoffa headed the Teamsters, one of the two powerful US labor confederations, from 1957 to 1967. He was sent to prison for jury tampering and fraud in the late 1960s and disappeared without a trace in 1975, presumably killed by former Mafia associates. (Photo credit should read AL MUTO/AFP/Getty Images)
ROSEVILLE, MI, - SEPTEMBER 27: Crime scene tape marks off the site where a tipster reported to police that the body of former Teamster's union boss Jimmy Hoffa may be buried September 27, 2012 in Roseville, Michigan. Ground penetrating radar indicated there is an anomaly under the concrete and police officials are planning to bore there on Friday. The former Teamster's president disappeared from a restaurant parking lot in Bloomfield Township, Michigan in 1975. (Photo by Bill Pugliano/Getty Images)
The famous rapper Tupac Shakur was shot to death in Las Vegas in 1996. One of the highest-profile murders in recent memory, it has yet to be solved.
Six-year-old Madyson Jamison mysteriously disappeared with her parents in Oklahoma in 2009.
Their remains were identified just a few miles from their abandoned truck in July 2014, in the remote Sans Bois Mountains.
Authorities discovered $32,000 in cash in the truck, and family members have expressed fears that the family was killed by a violent cult.
In 2007, 21-year-old Paul Quinn was murdered in Northern Ireland.
The attack was so brutal that every major bone in his body was broken. His assailants, believed by authorities to be members of the IRA, have yet to be identified or arrested.
The women of Juarez
Since 1993, more than 370 local women and girls have been murdered in the Mexican border town of Ciudad Juarez.
Authorities have concluded that roughly half of the violent attacks have been prompted by motives such as robbery and gang wars, but few arrests have been made.
Mystery buffs are obsessed with the case of actress Elizabeth Short, murdered and dismembered at age 22 in 1947.
Theories abound, but no arrest has ever been made.
Four NJ women
In 2006, the bodies of four women were dumped near the low-cost Golden Key Motel in Egg Harbor Township, New Jersey.
The dump site was less than 200 yards from the Atlantic City Visitors Welcome Center.
Police have made no arrests but have said they're eyeing more than one suspect.
Officer Jason Ellis
One early morning in 2013, police officer Jason Ellis got out of his cruiser to pick up some debris on a Kentucky highway. He was shot to death from a nearby hill.
Investigators have called the unsolved killing a premeditated attack.
This 1997 photo shows rapper Christopher “Notorious B.I.G.” Wallace leaving a Los Angeles party shortly before he was shot to death.
The shooting has never been solved.
This Rembrandt painting, "Storm on the Sea of Galilee," was stolen from a Boston museum as part of an epic, $500 million art heist in 1990.
FBI agents have stated they have a suspect in mind, but not a location for the stolen treasures.
John P. Wheeler III
The body of Army veteran John P. Wheeler III was discovered Dec. 31, 2010 as a waste management truck emptied its contents in a Delaware landfill.
He had been seen the day before, wandering erratically but refusing help.
His death has been ruled a homicide via blunt force trauma, but few other details have emerged.
New Jersey newspaper reporter David Bird was last seen leaving his home for a walk in January 2014.
His body has since been found in a local river, but his cause of death is still under investigation.
This hoard of 1,427 Gold-Rush era U.S. gold coins was discovered by a middle-aged California couple in 2013.
The origins of the stash -- a San Francisco Mint heist, perhaps? -- have never been determined.
Gilgo Beach victims
Up to 17 people are believed to have been murdered by a single killer over the past 20 years, many of them dumped along Gilgo Beach, about 40 miles from New York City.
More than one serial killer may be involved, local investigators have said.
Terrie Ann Dauphinais
Terrie Ann Dauphinais was found murdered in her Calgary, Alberta home on April 29, 2002.
Her children were locked inside the house with her body for hours before it was discovered. The case remains unsolved.