Walter Brown, a recent multi-million dollar winner in the lottery, is found stabbed to death in his apartment with $50,000 floating out of his window. While most of Walter's friends, including his best friend from his old mining job, chalked up recent behavioral changes to his newfound wealth, Megan finds an endocrine tumor which could have caused the changes. In another case, Kimberly Gleason went into the hospital for an appendectomy and died of a serious bacterial infection. Ethan has trouble finding the cause, until a second patient turns up dead. With Kate's help, Ethan learns how to run an investigation and deal with grieving family members. Meanwhile, Lacey uses her mother's credit card without permission to buy a $300 hat. Megan returns it and makes Lacey do filing work at the morgue to earn her own money.