10. Your Number's Up

Complete story — includes the ending

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, chalked up recent behavioral changes to his newfound wealth, Megan finds an endocrine tumor that 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 Megan's credit card without permission to buy a hat. Megan returns it and makes Lacey earn her own money---in a way that gives Lacey new insights into the work her mother and the team do. Victims: Walter Brown (Accident Knife) Kimberly Gleason (Hospital Infection) Luisa Hernandez (Hospital Infection) Murderers: Hospital - Kim/Luisa Walter Brown (Killed Himself by Accident) Recurring character: Nathalie Kelley as Dani Alvarez.