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An investigation has revealed new details about a Satanist author in southern Utah whose writings directly inspired the teenage killer of two sisters in London.

Danyal Hussein, 19, was sentenced last month to 35 years in prison for murdering two sisters in London.

A review of police evidence and his online history shows Hussein carried out the killings by following instructions allegedly written by author E.A. Koetting.

Koetting’s real name is Matthew Joseph Lawrence. He is 40 years old and lives in Apple Valley, Utah. The author sells books and courses online, claiming to be able to teach others how to harness black magic and “become a living God.”

Although there’s no evidence Koetting has ever spoken or met with Hussein, the author’s material openly discusses and promotes murder.

At least one of Koetting’s books prompts readers to follow a specific set of instructions to create a powerful death pact with a demon named “Lucifuge Rofocale.”

Hussein’s murders took place in June 2020, when Bibaa Henry was celebrating her 46th birthday with her younger sister Nicole Smallman. The two met up with friends at a local park to have a picnic.

Three days earlier, surveillance video shows Hussein bought knives and candles at a local supermarket.

According to a copy of the written “pact” obtained by police, Hussein had entered into a demonic contract with Lucifuge promising to “sacrifice” a minimum of six people — “only women” — every six months.

In October, a BBC investigation revealed how the killer spent hours online on a satanic forum, describing himself as a “psychic vampire” who learned his “first ever spell” from Koetting.