for two years Diane Murphy shared the role of Tabitha Stephens on Bewitched with her faternal twin sister Erin but it was obvious when it was Diane playing the role.
Diane never seemed at ease in front of the camera. Diane was realeased from Bewitched at the start of series 5.
but Diane did play Tabitha solo in one episode (Samantha Fights City Hall), it was very obvious that it was not Erin playing the role but many didn't even realise it was Erin's sister, the two were so unalike. Elizabeth Montgomery, who played Tabitha's mum Samantha, seemed in this episode to guide Diane more than she ever did Erin.
Diane appeared a couple more times as a guest in Bewitched but she never returned to acting.