Elizabeth Short: 1947
　　Her name was Elizabeth Short, and she was just 22 years old when, on Jan. 15, 1947, she was found posed naked in a vacant lot in Los Angeles, sawed in half at the waist, drained of her blood, and slit from the corners of her mouth to her ears.
　　The Case of "The Black Dahlia": 1947
　　Short's body lies in the grass of the vacant lot. Her murder has been the subject of books and films, many of them offering up theories about who killed her and why — but in real life, the case remains unsolved. Also unclear is how she came to be known in pop culture as "The Black Dahlia" (a dahlia is a flower): One story has it that friends of the raven-haired young woman gave her the nickname, playing off the title of the 1946 film noir The Blue Dahlia. Still others contend the moniker came after her murder, invented by reporters working the salacious case.
　　

The Murder of TV's Bob Crane: 1978
　　He had been the handsome star of the goofy sitcom Hogan's Heroes, but the circumstances of Bob Crane's death seem more fitting for a gruesome CSI-style show: On June 29, 1978, the 49-year-old entertainer was found bludgeoned to death inside an apartment in Scottdale, Ariz……, reportedly with semen on his body.
　　A prime suspect in Crane's murder was his friend John Henry Carpenter, a video equipment salesman who helped the married Crane make sex tapes with various women. At the time of the murder police found blood in Carpenter's car, but DNA testing was not yet advanced enough to determine whether it was Crane's, and the district attorney declined to prosecute due to insufficient evidence. In 1992 the case was reopened and Carpenter, who maintained his innocence until his death (in 1998), stood trial; he was found not guilty because the evidence had been improperly preserved. A 2002 movie called Auto Focus, starring Greg Kinnear as Crane and Maria Bello as his second wife Sigrid Valdis (pictured, 1974), reintroduced moviegoers to the case, and presented suspicions about Carpenter's role in Crane's death.
　　

Jill Dando, Murder of a British Star: 1999
　　The very popular BBC newsreader was shot point-blank in the back of the head on April 26, 1999, outside her home in West London. Barry George, a man who lived nearby and who had a history of stalking women, was convicted and sentenced to life in prison, but after appealing the sentence George got a new trial and was acquitted. So who was the killer？ Theories starring jealous exes, deranged fans, and even business rivals have swirled for years.
　　The Cryptic Zodiac Killer: 1968-1969
　　Between December 1968 and October 1969, at least five people and possibly seven in Northern California died at the hands of a man who called himself the "Zodiac" and who later teased newspapers about his identity by sending letters, some encrypted, for publication. Pictured: a message the Zodiac Killer wrote on a greeting card and sent to the San Francisco Chronicle on Nov. 11, 1969. At the bottom of the letter he lists the months the killings took place, and the total murders he claims (seven).
　　At the time of the Zodiac murders, Robert Graysmith was a cartoonist at the San Francisco Chronicle, and became intrigued with the mystery of it all, particularly the killer's coded messages. He later wrote a book about his investigations and his obsession with cracking the case; that tome was adapted into a movie called Zodiac (Jake Gyllenhaal plays him). Pictured: Graysmith in 2007 with cryptographs the killer used.
　　Many (including Robert Graysmith) believe that a man named Arthur Leigh Allen (now dead) was the Zodiac Killer. But in April 2009, a woman named Deborah Perez (pictured) came forward to say that her late father, Guy Ward Hendrickson, was the murderer. Of course, that claim was pretty much dismissed once Perez later insisted that she was the illegitimate daughter of John F. Kennedy.
　

　The Murder of Molly Bish: 2000
　　While working as a lifeguard at Massachusetts' Comis Pond during the summer of 2000, 16-year-old Molly Bish was kidnapped. The search for her was the largest in state history, but sadly the girl's remains were found in 2003, just five miles from her home. No arrests have ever been made in the case, though a new suspect emerged in February 2009: He is Rodney Stanger, who lived near Bish in Massachusetts at the time of her death, had a car similar to one described as parked near the lifeguard station, fished at Comis Pond, and hunted in the woods where Bish's body was found. He is also currently awaiting trial for the murder of his live-in girlfriend in Florida.
　　Who Was Jack the Ripper？: 1888
　　The identity of the person who slashed the throats of poor women in 19th-century London has never been discovered, but theories have run rampant. One even holds that Jack the Ripper was actually a woman. Pictured: Buck's Row in 1888, now Durward Street, where the body of Jack the Ripper's first victim Mary Ann Nichols was found lying across a gutter.
　　What Ever Happened to Jimmy Hoffa？: 1975
　　He had been the powerful president of the Teamsters, the largest labor union in the United States, but by 1975 Jimmy Hoffa was struggling to regain his post after doing time for jury tampering and fraud (Richard Nixon pardoned him in 1971). On July 30, 1975, he was due to meet with two Mafia leaders at a suburban Detroit restaurant; he disappeared from the parking lot and was never seen again. Though it's unclear exactly what happened to Hoffa — he was declared legally dead in 1982 — he's spawned an enduring urban legend: that he's buried under an end zone at Giants Stadium (which was under construction at the time of his disappearance).

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