In 1978, 11-month-old Chad Shelton was admitted to an Omaha hospital because of chronic vomiting. The next day Chad went into a coma and died. Duane Johnson was also admitted to the hospital with the same symptoms. He died the next day. Dr. Renea Kimbrough discovered that all of the sick individuals had visited the Johnson home on Sunday, September 10, and all ate a meal together. Everything in the Johnson home was analyzed. They came to a conclusion that DMN was added to the lemonade they were all drinking. Steven Ray Harper, an old boyfriend of Sandra Johnson, worked for a local company in Omaha, Nebraska called the "Eppley Institute". Harper admitted to spiking their lemonade with DMN. In 1979, Steven Harper was sentenced to death in the electric chair.