The pilot and the pilot-rated passenger were killed when their Mitsubishi MU-2B crashed while trying to return to Centennial Airport in Denver. According to the NTSB, within a few minutes of taking off on an IFR flight to Salt Lake City, the pilot of the twin turboprop told ATC he had a problem and needed to shut down an engine. The airplane, N538EA, was owned and operated by Flight Line, of Watkins, Colo.