Kellogg was arrested at Denver International Airport.
The U.S. Attorney's office says he was planning to kill a business associate who successfully sued him in Steamboat Springs.
Kellogg faces up to 10 years in prison if convicted.
Chicago man charged in alleged murder-for-hire plot
October 22, 2010 Brooks Kellogg, 73, is accused of paying $2,000 to hire a hit man who turned out to be an undercover agent.
