By John Ingold:  As a federal agent testified in a court hearing Tuesday, the man — identified in court and investigation documents only by his initials, K.K. — walked toward the figure from his past.  "(K.K.) indicated that he had confronted him," Homeland Security Investigations special agent Jeffrey Lembke testified. "He indicated he said, 'Aren't you Kefelegn Alemu Worku?'"  Thus started a sequence of events that brought a Denver parking lot attendant — charged officially under the name John Doe — into a federal courtroom Tuesday. Federal officials allege that John Doe, who had used the name Habteab Temanu, is in fact Worku, a former high-ranking guard at the Ethiopian prison "Higher 15."  Read More…