Rosarito, Mexico/Santa Barbara, California - A Californian man influenced by QAnon and Illuminati conspiracy theories believed that his two children "were going to grow into monsters."

Surf instructor Matthew Taylor Coleman confessed to stabbing his three-year-old son and one-year-old daughter to death with a spearfishing gun on Monday.

He had previously crossed the border into Mexico with both of his children.

According to the New York Post, his wife reported them missing on August 7, after Coleman left their shared Santa Barbara home without telling her.

However, she never suspected her children were in any danger.

After the gruesome act, Border Patrol became aware of the 40-year-old as he attempted to re-enter the United States alone two days later.

The officers "observed what appeared to be blood" on paperwork in his vehicle.

Mexican police later found the bodies of his young victims in a ditch in Rosarito.

In an interview with FBI agents, Coleman "explained that he was enlightened by the QAnon and Illuminati conspiracy theories and was receiving visions and signs revealing that his wife ... possessed serpent DNA and had passed it onto his children," according to a criminal complaint filed in a Los Angeles federal court and obtained by the Daily Beast.

Coleman said he thought he was saving the world from monsters by killing his kids.

According to Baja California's attorney general Hiram Sanchez, Coleman stabbed his son a total of 12 and his daughter a total of 17 times.

An acquaintance of the family told the news site that he trusted the surf instructor so much that he "would have handed him my own kids in a second, to take them surfing. I've never heard of one parent complain about his program. So...it just doesn’t make any sense."

It's when Coleman became obsessed with QAnon conspiracy theories.

In November 2020, her shared a post about his Christian faith on Facebook, wondering, "What if there is a type of Great American Renaissance following the years of Covid, censorship, and political divisiveness...".

Coleman is now expected to face charges of aggravated murder in Mexico.