Gabrielle Mueller left her 9 and 8-year-old kids with a teenage sitter on April 1, 2001 so she could go to McDonald's to buy them McFlurries ice cream. Her strangled body was found in a wooded area in Lakewood, N.J., two days later. Her killer remains at large, though investigators believe the case is "solvable." Journalist Brian Johnston of the Abury Park Press investigates.