This episode covers the murder of Mark Kilroy, a spring-breaker who went missing around Matamoros, Mexico in March of 1989. The discovery of Mark's mutilated remains on a ranch just outside Matamoros three weeks after his disappearance led to the discovery of 14 more bodies and the sinister inner workings of a drug cartel turned human sacrificing cult, led by a man named Adolfo Costanzo who believed that human sacrifice was the key to money, protection, and power.

SOURCES:

https://en.m.wikipedia.org/wiki/Adolfo_Constanzo

https://www.texasmonthly.com/true-crime/the-work-of-the-devil/

https://en.m.wikipedia.org/wiki/Murder_of_Mark_Kilroy

https://www.rollingstone.com/culture/culture-features/the-believers-cult-murders-in-mexico-53577/amp/https://allthatsinteresting.com/mark-kilroy

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