love, your niece, anna kate. >> reporter: anna kate was 7 when her aunt died. it was sudden, scary and heartbreaking. so she took out an old shoe box, decorated it and filled it with thoughts of aunt toni. >> now she's dead. now we can't see her again. and our lives will never be the same again. >> reporter: the ripple effect of toni's death was huge. she was a respected doctor, an ophthalmologist who had a thriving practice first in jackson, mississippi, and later in denver, colorado. a devout christian who sang in her church choir. a mother to a little girl named haley. a wife to man named harold, and the older sister to anna kate's dad todd bertolet. this story is about toni and what happened to her one bright sunny day high up in the mountains. >> 911. what's the address of your emergency? >> i need an alpine mountain rescue team immediately. >> reporter: it's also about how secrets long buried sometimes don't stay that way. where did toni fit into your family? >> she was the middle between two brothers. sometimes she thought that was an advantage and somet