Introduced on a recurring basis during season 2 was Carolyn McCormick as Dr. Elizabeth Olivet, a police psychologist brought in on a case-by-case basis. NBC had been pushing for the producers to add female characters to the all-male cast. She was added to the opening credits as "also starring" in Season 3 and 4 but, despite the attempts of the producers to include her in as many episodes as possible, it was found to be difficult to incorporate her into the show due to the format leaning heavily on the police and prosecutors. She was removed from the credits in Season 5.