It was New Year's Eve 1997 in the Marlborough Sounds of New Zealand when 17-year-old Olivia Hope and 21-year-old Ben Smart enjoyed a long night of partying. When friends couldn't locate the pair the following day, they assumed the two may have gone off on their own. But after days without contact, it became evident that something was very wrong.

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On the 10th floor of a hotel in Kansas City, a mysterious guest meets a gruesome end.

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After the death of Sam Giancana, investigators found that he had plenty of enemies, and lots of reasons to look over his shoulder. Neither the Chicago Outfit nor the CIA were pleased that he agreed to testify about his criminal activity. But authorities had little to go on because nobody was talking.

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Days before he was set to testify at a Senate hearing, one of Chicago’s most notorious mob bosses was found dead in his home. Sam Giancana was once a teenage getaway driver who rose to the top of Chicago’s Outfit, becoming a kingpin with influence and power on a national scale. And yet his dealings with the Kennedys and the CIA turned him into a target within his own ranks.

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It’s believed that the Santa Rosa Hitchhiker Killer murdered eight women during the 1970s. Investigators speculated it could have been the work of the Zodiac Killer or even Ted Bundy. But a recent discovery has led to another possible suspect.

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Santa Rosa was a safe, peaceful town going into the 1970s. But in a few short years, police realized that five hitchhiking young women had disappeared. Four of them were found dead. And a serial killer was on the loose in their small town.

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The spree continues into Christmas Day and beyond, during which the teen gang murders their third, fourth, fifth and sixth victims. After a tip, police catch the group wearing victims’ clothing, driving a victim’s stolen car, and in possession of the guns they used in their murders. A Parcast holiday special from Serial Killers.

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In the early hours of Christmas Eve 1992, a senseless murder in Dayton, Ohio, marks the beginning of a rampage. What started as a desire for Christmas cash turns into a three-day killing spree that leaves six people dead. Even more shocking was that the brazen killers were just teens. A Parcast holiday special from Serial Killers.

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A 19th-century adventurer obsessed with reaching the North Pole set out in the summer of 1871. But the Arctic expedition would be the death of him. Was it the severe weather conditions that bested the seasoned explorer — as the ship’s doctor always claimed? Or did someone onboard have it out for the commander?

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The deaths at Greystone mansion were far from straightforward — at least as far as Detective Leslie White was concerned. But shortly after the DA announced they’d be launching a full investigation, they closed the case. The official narrative was that Hugh Plunkett shot Ned Doheny before turning the gun on himself. The evidence tells a different story.

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