The Zodiac killer threw the city of San Francisco into a state of terror in the late 1960s, murdering multiple innocent people, then taunting the authorities and press into trying to find them. Sending multiple letters and complex ciphers, or puzzles, challenging everyone and anyone to break their code. Now one amateur sleuth says he’s cracked the Z13 cipher revealing the Zodiac Killer’s identity. “Who's Zodiac? One of the great unsolved serial killing mysteries of all times.” “Kill Code: The Zo

Spahn Ranch, a 55-acre movie ranch in California became infamous for being the headquarters for Charles Manson’s cult in the 1960s. 56 years later, Impact x Nightline visits the land where the Manson Family plotted their murders. “EVIL: Manson Killers Freed?” — from IMPACT x Nightline – is now streaming on Hulu. #MansonFamily #SharonTate #CharlesManson #TrueCrime #IMPACTonHulu | Nightline

A vascular surgeon has gone from scrubs to a prison uniform. Michael McKee was married to Monique Tepe for two years, until their clean cut divorce. How did Michael become the main suspect in Monique and Spencer Tepe’s murder? Tune in to “IMPACT” by Nightline’s “The Perfect Couple: Inside the Ohio Murders” to learn more. Now streaming on @Hulu. #ImpactOnHulu #TrueCrime | Nightline