PHOENIX -- A "fanatical supporter" of President Barack Obama is the prime suspect in an investigation into an Internet death threat against Maricopa County Sheriff Joe Arpaio.
Adam Eugene Cox, 33, was arrested in Tennessee Friday on an unrelated warrant for assault.
Working with MCSO, deputies in Knoxville, Tenn., served a search warrant and seized evidence from Cox's home on Friday after an investigation into the death threat came to light in October.
In that threat, Cox stated Arpaio and his family would be killed, according to MCSO. His postings read, in part: "I plan to kill Arpaio first. He will be filled with a thousand bullet holes before the year is out. I promise you this. He won’t [expletive] with Obama. He will be buried 10 feet under and his whole family will be murdered along with him."
The Maricopa County Sheriff's Office said the suspect's postings indicate he is an avid supporter of Obama and that Arpaio's ongoing investigation into the legitimacy of the president's birth certificate may be behind the death threat.
Cox's mother confirmed her son is a fanatical supporter of Obama, according to MCSO officials.
Knoxville deputies said Cox has a history of assault.
"I will not be intimated against pursuing this investigation into Obama's eligibility to serve as the president of the United States," Arpaio said.
Arpaio has faced numerous death threats while in office, including several different Mexican drug cartels which have threatened the sheriff's life and placed a contract nearing $4 million for his execution. Officials said this death threat is the first involving the Obama investigation.
At Google's headquarters in California, deputies served a separate search warrant involving a different threat against Arpaio related to the recent shooting death of Maricopa County sheriff's deputy William Coleman.