An updated report on the murder trial of Frederick Mueller, who was charged with the 2008 murder of his wife, Dr. Leslie Mueller. She was killed while the two were out for a walk near their vacation home in Lake City, Colorado. According to what Frederick Mueller told police, while the Muellers were hiking, Mueller stopped to take a photo of his wife near the edge of a cliff. He said his wife lost her footing near the waterfall and plunged into a creek. Her body was swept away downstream. It appeared to be an accident, but investigators were skeptical and believed it was murder. This classic "48 Hours" episode last aired on 9/6/2014. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.