Who are the 3 women that have disappeared and who's the guy? Any similiarities between them other than the disappearance?

The man's name is Robert Weeks. The women were Patricia Weeks (his wife) and two girlfriends Cynthia Debore and Carol Ann Riley. The similarity is they were all involved with him over a span of several years. I'm not sure about the situation with the wife but I believe the other two had been dating him and were getting ready to break it off when they disappeared.