A Wisconsin high school student killed his parents as part of a larger plot to “obtain the financial means” to assassinate US President Donald Trump, the FBI said.
Nikita Casap, 17, allegedly shot his mother Tatiana Casap, 35, and 51-year-old stepfather Donald Mayer at their home in Waukesha near Milwaukee on February 28.
Authorities charged the teenager with first-degree murder, theft and other crimes.
Casap is said to have lived with the decomposing bodies for weeks before fleeing with $14,000 (£10,000) cash, passports and the family dog. He was arrested last month in Kansas.
Federal authorities accuse him of planning his parents’ murders, buying a drone and explosives then sharing plans with others, including a Russian speaker.
His intentions are detailed in a three-page anti-Semitic manifesto praising Adolf Hitler.
The warrant filed at the federal court in Milwaukee also contains excerpts of communications on TikTok and the Telegram messenger app relating to a neo-Nazi group called the Order of Nine Angles.
“Casap appears to have written a manifest calling for the assassination of the President of the United States,” it states.
“He was in touch with other parties about his plan to kill the President and overthrow the government of the United States.
“The killing of his parents appeared to be an effort to obtain the financial means and autonomy necessary to carrying out his plan.”
In court, prosecutors alleged Casap was in touch with a person who speaks Russian and shared a plan to flee to Ukraine.
Citing Casap’s writings, the federal warrant said the teenager wanted to spur governmental collapse by “by getting rid of the president and perhaps the vice president”.
The defendant had a preliminary court hearing on April 9 and has not entered a plea to the charges.
He is next due to appear for an arraignment on May 7 and is being held in custody on a $1million (£764,000) bond at Waukesha County jail.