just said he was reaching out to friends and -- catching up with people. >> reporter: he called mary jumbelic's home too with a strange announcement. >> "sorry i haven't called, i've been out of touch, i'm gonna go visit my daughter who is studying in israel." >> reporter: until now, mary had seen bob as a grieving widower who lost his wife in a tragic accident. but this conversation suddenly gave her pause. >> there was something he said on that call that bothered you? >> that, "i'm sorry i've been outta touch, i'm gonna be out of touch again, i'm leaving." it felt odd. >> did it concern you that he was leaving the country? >> sure. >> reporter: so she decided to make a call to an old colleague to discuss her sudden suspicions. >> i've had quite a long history of dealing with sudden and violent death, and cases of suspicious circumstance as well as natural deaths. >> reporter: turns out, mary is "doctor mary jumbelic", the former onondaga county medical examiner. >> i thought, "i should just close the loop with the information and just call the district attorney." >> what was his response? >>