When CSI first started filming, Helgenberger visited the Clark County Coroner's Office to learn about her role, even viewing autopsies in progress. Helgenberger got the chance to act with her husband, Alan Rosenberg, when he guest-starred on CSI, season five (``Weeping Willows'') and season seven (``Leaving Las Vegas''). During _her_ time on the show, Helgenberger acted in the feature film Erin Brockovich and portrayed Patsy Ramsey on the miniseries about the mysterious murder of six-year-old beauty-pageant contestant JonBen*t Ramsey in Perfect Murder, Perfect Town. <sep>, Pronoun: her <sep>, A: Helgenberger <sep>, B: Erin Brockovich