elaine rountree: yes. josh mankiewicz: pretty quickly. elaine rountree: yes. nkiewicz: but andre wasn't arrested at marie's funeral... or the next day... or the day after that. after the service, elaine and her relatives flew back to philadelphia. a few weeks later, marcus joined them. marie's relatives still expected an arrest any day. but days turned into weeks, and then months -- until a whole year had passed. and that's when a mysterious letter arrived for the singleton family, an anonymous letter that sent this investigation in a whole new direction. craig melvin: coming up elaine rountree: we didn't know where the letter came from and because she worked for the cia, it opened up that door of suspicion craig melvin: was her death related to her job? the questions start all over again. craig melvin: when dateline continues. when you live with diabetes, progress is... having your coffee like you like it without an audience. ♪♪ [silence] the freestyle libre 3 plus sensor tracks your glucose in real time so everyone else doesn't have to, and over time it can h