 The Marshall case attracted the attention of true crime author Joe McGinniss, whose book on the case, "Blind Faith", was published in 1989 and became a bestseller.It was adapted into an Emmy-nominated 1990 TV miniseries of the same name starring Robert Urich as Marshall and Joanna Kerns as Maria.During filming, Kerns became very close with the Marshalls' son Roby, who served as a consultant on the miniseries.