Susan Dey

In the second edition there will be a reunion of "The Partridge Family", but it will not feature Susan Dey, popular with many as Laurie Partridge.

While the show was originally on there were rumours of a romance with David Cassidy but this appeared to be more on Susan's part than from David

Source: http://www.onlykent.com/20100302/partridge-family-reunion-on-the-today-show-without-susan-dey/