Lawyers for Ward Churchill and the school had reportedly agreed Thursday on a payment that would've freed the university of the provocative teacher, without litigation, the Denver Post reported Saturday.
But Friday revelations about a plagiarism case involving Churchill emerged, as well as a reported threat against a Canadian scholar.
Former state Senate President John Andrews published a report claiming Churchill had committed plagiarism and academic fraud. And a Canadian University gave UC a lawyer's opinion on the 13-year-old plagiarism case involving Churchill.
That lawyer determined Churchill had published the work of one of the school's professors, Fay Cohen, without proper citation, said a spokesman for the Canadian school.
He added Cohen had complained of Churchill threatening her when she denied his request to use her material.
The news of the Canadian case prompted Colorado regents to halt buyout talks with Churchill's lawyer.