. >> sandra kimbro: i'm a..., a mother, a grandmother, and now a felon. >> pelley: like a lot of people, she took in her aging, ill mother, and had a joint bank account with her. when her mother died, the disability benefits kept coming. when did she die? >> kimbro: she died... 1984. >> pelley: when she died, did you report her death to social security? >> kimbro: i did not. >> pelley: why not? >> kimbro: i thought perhaps it would have been taken care of by the funeral director at some point. >> pelley: were you surprised that these benefits kept coming to you? >> kimbro: no, not initially because i had had a conversation with my mom prior to her death that i would be entitled to the benefits. so i had just assumed and went along with that, thinking that i was entitled. >> pelley: and what did it come to? >> kimbro: over a 30-year period, $160,000. >> pelley: though she took the checks for three decades otherwise, sandra kimbro is no one's idea of a thief. she and her husband had good full-time jobs through reti