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When Scott Michaels began the “Helter Skelter” tour about eight years ago, he offered it roughly once a month. Now, he guides people around the sites of the Manson family murders at least once a weekend, often selling out weeks in advance.

The three-and-a-half-hour tour is often filled with middle-age adults who were children during the murder spree that Charles Manson, who died Sunday, orchestrated in the summer of 1969.

“There’s seemingly no end to it,” said Mr. Michaels, who runs several other tours through Dearly Departed, his company and museum. “A lot of it has to do with the feeling that this scared us all. Up until then you thought you were safe in your own bed.”

The fact that the murders happened “in the sanctuary of the home” contributed to much of the fear that captivated people at the time, said Steve Oney, who wrote an oral history of the killings for Los Angeles Magazine in 2009.