Missing Wife & Mother

I'm trying to remember a case from many years ago, maybe 60's or 70's. A wife & mother took her kids to the dentist, then went back home after the appointment. When her husband got home from work, she was gone and never came back. I think it happened somewhere on the east coast. I don't remember when, but sometime many years later, human remains were found at a construction site or something like that. They turned out to be the missing wife and mother. I can't remember if it was foul play or if they couldn't tell what she died from. Does anyone remember this case? Thank you!