Partridge Family Drama: Susan Dey's David Cassidy Crush Went Unrequited

June 1970: David Cassidy and Susan Dey, costars of the television series 'The Partridge Family,' standing together and smiling while at an ABC party held at the Bistro. Source: (Photo by Frank Edwards/Fotos International/Getty Images)

David Cassidy was a major teen heartthrob for countless American teenage girls. Susan Dey was a beautiful brunette who had the attention of all the teenage boys. The pair were television brother and sister on the hit sitcom The Partridge Family. The show was about a fictional family musical act, but songs by The Partridge Family -- like those of TV-show band The Monkees in the 1960s -- were real-world pop-chart hits.