reporter: this is such a heartbreaking story. a 90-year-old woman, 90 years old ripped oof and a want tole you, bay harbor island police tell me, they haven t seen a case like this in a number of years. at least five years. but now that it has happened, they want to warn the public. at my age, i mean you think you re going to go peacefully and it s no doesn t work out that way. reporter: 90 yeerld nancy cohen is devastated. you can t trust anybody. it s terrible. reporter: saturday she was duped and thieves got away with thousands of dollars worth of cash and jewelryncluding an engagement ring her late husband gave to her. i had one box that i had rings in so my engement ring. hi a big material ring. i had a diamond range ring that somebody left to my father t. diamond in it. it. reporter: it began with a man coming to her door wearing some type of uniform. a company logo on the shirt. the scam. nancy needed to trim trees overhanging her property. but he a shirt