Jennifer married actor Tim Matheson, having met during the filming of Yours, Mine and Ours. The marriage lasted only a short time (1968–1971).
She also played guest spots on various TV shows, including McMillan and Wife and Hawaii Five-O. In 1973, she played Erica Jordan, Mary's temporary replacement at WJM-TV, in the season four episode, "Better Late...That's a Pun...Than Never", in The Mary Tyler Moore Show.
Leak played the role of Olive Springer Gordon Randolph in the soap opera Another World (1976–1979), and Blanche Bouvier in Guiding Light (1981–82). In addition, Jennifer created the role of Gwen Sherman, who started out as a prostitute who fell in love with Greg Foster and ended up becoming a nun in the mid-1970s on the CBS soap, The Young and the Restless.
