Sue Ann Marcum, a popular accounting professor at AU, was found dead in her home last October. Last month, Maryland and international law enforcement authorities issued a warrant for an arrest in her murder, for Jorge Landeros, a former Spanish teacher and friend of Marcum's living in Mexico.
But Landeros has proclaimed his innocence in communications online and in a phone interview with the Washington Post, saying authorities want to make him a "scapegoat" for the murder.
Landeros reportedly told detectives in El Paso, Texas, that he would not come across the border to answer questions about the case; although he did invite authorities to brunch at a cafe in Juarez to discuss the case, according to the Post report.
Marcum's killing was originally thought to be a robbery gone wrong, after her car was found in the possession of an 18-year-old D.C. resident. But that person was only ever charged with unauthorized use of the vehicle.