The suspect, Jay Devaughn, of Denver, faces a federal charge of mailing threatening communications and was told he could face up to five years in federal prison and up to a $50,000 fine.
He is due back in court on Wednesday for a detention hearing. His preliminary hearing is set for March 10.
Many details about the white powder have not been released, but 9Wants to Know has learned the mailings happened during 2009. Officials will not say if the mailings were sent to Sen. Udall and Sen. Bennet's local or Washington D.C. offices.
Coffman spokesman Nat Sillin said the powder came in an envelope mailed to the Congressman's Lone Tree office. The envelope arrived Nov. 24, 2009.
The envelope contained one sheet of tri-folded white paper. There was nothing written on the paper, Sillin said.
"Postal inspectors came out and determined the powder wasn't dangerous and was not toxic," Sillin said.
9Wants to Know has also learned other leaders may have been targeted by the mailings.
Authorities also say Devaughn left several threatening voicemail messages for people in the Denver Metro area saying, "How do you want to die," and "I'm going to blow both of your brains out." They say he targeted his high school trigonometry teacher.
They also say, he used those victims names on the return addresses for several packages containing white powder that he mailed to lawmakers.
Devaughn is in custody of the United States Marshal Service. FBI agents arrested him Friday at Porter Hospital, a day after his attorney says Devaughn checked himself in for a mental health evaluation.
"My No. 1 priority is getting his [Devaughn's] mental health issues addressed," John Scipione, Devaughn's attorney said.
Scipione says his client has not received the mental health medications prescribed to him at Porter Hospital.
Jefferson County Sheriff's Office spokeswoman Jacki Kelley says Devaughn is receiving his medications.
Scipione said his client checked himself into the hospital after several search warrants were conducted including one at his office at the Community College of Aurora.
Devaughn worked at the community college as the director of library services.
Linda Bowman, president of the community college, says Devaughn, who was voted the school's administrator of the year in 2009, was placed on unpaid administrative leave.
"He's someone that could be described as a good employee, who participates and does his job well," Bowman said. She said she had no knowledge of what went on in Devaughn's personal life.
According to Bowman, the FBI told her there was never any threat to the community college.
"We will wait to see how this case unfolds," Bowman said.
Bowman says the community college has been cooperating with the FBI in its investigation. She added that she spoke with a number of people in the community college on Monday and said "people are very upset."
Devaughn's office remained cordoned off by the FBI while agents continue to investigate. School officials say that's where agents have focused their investigation at the community college.
The United States Postal Inspection Service's Dangerous Mail Investigations team assisted the FBI in the investigation and arrest.
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