Serial Killers Serial Killers

A Police Forensic Identification Services vehicle on scene while authorities comb through an apartment in Toronto in connection with the investigation of an alleged serial killer. Richard Lautens/Toronto Star via Getty Images hide caption

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Richard Lautens/Toronto Star via Getty Images

German police say they have evidence that former nurse Niels Högel murdered at least 84 people. He was already convicted in 2015 of two other murders. Above, Högel covers his face with a folder next to his lawyer in German regional court in 2014. Ingo Wagner/AFP/Getty Images hide caption

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Ingo Wagner/AFP/Getty Images

Donald Harvey is led back to jail in 1987 after pleading guilty to eight murder charges and one voluntary manslaughter charge in London, Ky. He was serving consecutive life sentences when he died Thursday at age 64. Ed Reinke/AP hide caption

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Ed Reinke/AP

Elizabeth Tracey Mae Wettlaufer, a former nurse accused of murdering eight elderly patients, leaves the courthouse Tuesday in Woodstock, Ontario. Geoff Robins /AFP/Getty Images hide caption

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Geoff Robins /AFP/Getty Images

A woman walks past a memorial for some of the victims who are said to have died at the hands of the serial killer dubbed the "Grim Sleeper." Mark Ralston/AFP/Getty Images hide caption

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Mark Ralston/AFP/Getty Images

Too Scared To Talk To Police, Stalker's Victims Open Up In 'Grim Sleeper'

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