Editor’s note: This story includes descriptions of racial slurs and threats many would find offensive. Read at your discretion.
A Casper man has pleaded guilty to leaving threatening, antisemitic phone messages earlier this year at Anti-Defamation League offices in Denver and Austin, Texas, in which he vowed to murder Jews and claimed that Adolph Hitler would make a resurgence.
Derek A. Fulfer, who entered a guilty plea Thursday in U.S. District Court in Casper, is scheduled to be sentenced on April 3. He faces up to five years in prison.
Fulfer, whose phone number and email address are not listed in public records, could not be reached for comment Friday.
Jeremy Shaver, deputy regional director for the ADL Mountain States Regional Office, which includes Colorado, Wyoming, and New Mexico, applauded efforts to prosecute Fulfer.
"We appreciate law enforcement taking the harassing, threatening, and antisemitic calls seriously and responding quickly to identify the individual responsible for making the calls," Shaver said in an email to Cowboy State Daily.
"As ADL has tracked a significant increase in antisemitic incidents across the country, it is critical to take these threats to harm Jewish individuals seriously and hold those responsible accountable for their actions,” he added.
The Threats
According to a sworn statement from FBI Special Agent Eli Voigt, Fulfer identified himself in three voicemail messages just minutes apart on March 5, 2025, left at the ADL Rocky Mountain States Regional Office in Denver, and in another threatening message to an ADL office in Austin.
In one message to the ADL Rocky Mountain Region office, Fulfer taunted Jews.
“You’re cowards,” he said in the message. “I see a Jew on the street, and I f***ing smack them. I am begging you to put me on your kike list, fa***ts.”
Fulfer then quickly called back and left another threatening message, according to Voigt.
“I want you to take a gun and blow your f***ing sorry pathetic brains out of your god**** mind,” he said. "Come find me. I can’t wait to murder you kike Jews.”
In a third message, he vowed that Hitler was coming back to destroy Jews.
Fulfer also left a voicemail at the ADL office in Austin, describing himself as a “famous Jew hater.”
“I will murder every Jew I see,” he said. “Go kill yourself.”
Verizon Wireless search warrant data showed all of the calls were made from Cheyenne, the statement said.
Denial
Voigt and another FBI agent interviewed Fulfer at his Capser residence on Aug. 7.
During the interview, Fulfer claimed not to know what the Anti-Defamation League was and that he did not recall leaving the voicemails, according to Voigt’s statement.
“Fulfer stated he believed that a Jew made a phone call to the FBI and opined that was the reason the FBI was talking to him,” the statement said. “Fulfer believed somebody had trolled him, as he gets trolled quite often, specifically on the social media platform X (formerly Twitter).”
FBI agents played portions of the threatening voicemails for Fulfer, who stated he believed someone had used his voice to leave the messages.
He added that the phone number for the calls was one that he had used previously, but he had changed it to a new number, the statement said.
FBI agents also interviewed Fulfer’s father, who listened to portions of the voicemails.
“Fulfer’s father could not definitively say it was Fulfer’s voice in the recordings, but stated they sounded like Fulfer and sounded like something he would say,” the statement said.
Fulfer later admitted to the FBI that he had called the ADL offices while he was in Cheyenne for work, but did not think anyone had been victimized.
“Fulfer thought someone could only be a victim if a specific victim was called out or targeted,” said the statement.
Wyoming recorded 31 anti-Jewish incidents in 2024, a 138% increase over the 13 incidents recorded the previous year, according to the ADL’s most recent audit of antisemitic occurrences.
The number of incidents has increased significantly since 2020, when there were none in the state.
According to the audit, notable incidents in Wyoming in 2024 involved:
• Individuals associated with the Goyim Defense League disrupting a Jackson Town Council meeting with antisemitic and racist comments.
• Twenty-eight incidents of white supremacist groups distributing antisemitic materials in a dozen towns.
Scott Schwebke can be reached at scott@cowboystatedaily.com.
