Charges were filed against a California surfing school owner who allegedly killed his two kids with a spear gun in Mexico in the belief that they would transform into monsters, authorities reported.

In a statement, the U.S. attorney’s office said that a federal charge of the foreign murder of U.S. nationals is being faced by 40-year-old Matthew Taylor Coleman of Santa Barbara.

It was not yet clarified If the suspect will have a legal representative for the case.

In an interview with the FBI, Coleman admitted that he brought his son, 2, and his daughter, 10, to Rosarito, Mexico, and fired a “spear fishing gun” into their chests, as stated in the FBI agent’s affidavit.

Court documents said that the suspect “believed his children were going to grow into monsters so he had to kill them.”

Authorities said that the bodies of his children were found by a farmworker at a ranch close to Rosarito in Baja California.

On Saturday, Coleman and his kids checked into a hotel in Rosarito but Mexican authorities said they left on Monday dawn, as seen in video footage.

Later that morning, Coleman returned alone and eventually left the hotel again for good.

Her wife filed a report on Saturday, telling the Santa Barbara police that her husband took their children and rode away with their van. She has no idea of their destination and that Coleman left her messages unanswered.

According to her, she had not seen any trouble with her husband, claiming that they were on good terms before he left.

The affidavit said Coleman’s phone was tracked in Rosarito on Sunday and on the next day, was in an area of Mexico, as reported by SFGate.

The suspect was held at the border checkpoint. In an interview with the FBI, “he explained that he was enlightened by QAnon and Illuminati conspiracy theories and was receiving visions and signs revealing that his wife, A.C., possessed serpent DNA and had passed it on to his children,” as stated on the affidavit.