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"RELATIONSHIPS FROM HELL: A DOWNHILL SLOPE"

Who Killed One of Aspen, Colorado's Most Beloved and Beautiful Free Spirits? "20/20" Unravels Details Behind the First Murder in the Upscale Colorado Town in a Decade Airing on Tuesday, September 16 on ABC

When Nancy Pfister, one of Aspen, Colorado's most beloved and prominent free spirits, was found bludgeoned to death in the master bedroom closest of her multimillion dollar home, the list of suspects sent the mountain town into a real life game of Clue. Could it be the local bank teller and Nancy's Best friend? Or her subletters -- a prominent physician and his renowned horticulturalist wife? Was it greed, jealousy, or something more sinister behind the slope side tragedy that shook this mountain town to its core? Deborah Roberts' riveting report includes an interview with Nancy Styler, the first time one of the main suspects in the case speaks. "Relationships from Hell: A Downhill Slope" airs on "20/20" on TUESDAY, SEPTEMBER 16, (10:00-11:00 p.m., ET) on the ABC Television Network.

"20/20" is anchored by Elizabeth Vargas and David Muir. David Sloan is senior executive producer.