The History Channel will air a special on the Manson Family murders, according to The Hollywood Reporter.

For the 40th anniversary of the shocking Hollywood murder spree, the network has scheduled the two-hour Manson on Sept. 7. It features an extensive interview with Linda Kasabian, who stood guard while her fellow cult members murdered actress Sharon Tate and others.

The star witness for Manson's prosecution, the reclusive Kasabian hasn't been extensively interviewed since an "A Current Affair" special on the 20th anniversary of the murders in 1989.

The special recounts the nine months leading up to what Manson dubbed Helter Skelter, a two-night murder spree that he and his LSD-addled followers thought would incite a race war.