The family has confirmed a 20-year-old McMinnville woman who died last month had contracted Rocky Mountain spotted fever from a tick bite.Katie Underhill passed away May 20 after a debilitating, five-week battle with the disease.According to the Tennessee Department of Health, there were 581 confirmed cases of Rocky Mountain spotted fever in Tennessee in 2016. The fatality rate is low as the state reports 16 people died from the disease between 2004 and 2014, the most recent data available.A family member described Katie’s death as heartbreaking and said the family remains in disbelief a tiny tick could kill such a healthy and beautiful young woman.Katie was first taken to a medical office April 12 after she complained of a severe headache and aches all over her body. She was diagnosed with the flu, which shares many of the same symptoms as RMSF.On April 16, Katie broke out in a bad rash.