Vargas was previously co-anchor of "World News Tonight," anchor of "World News Tonight Sunday," substitute anchor on "Good Morning America," correspondent for "20/20" and "Primetime Thursday," and co-anchor of "Primetime Monday." She joined ABC News from NBC News, where she was a correspondent and anchor, primarily for "Dateline NBC" and "Today." At NBC she also served as substitute anchor for the weekend editions of "NBC Nightly News." She joined NBC News in 1993 as a correspondent for the newsmagazine "Now With Tom Brokaw and Katie Couric."
Prior to joining NBC News, Vargas spent four years as a reporter and anchor for WBBM-TV, the CBS affiliate in Chicago. From 1986-89, she was the lead reporter for KTVK-TV, the ABC affiliate in Phoenix. Earlier she worked as a reporter/anchor for KTVN-TV, the CBS affiliate in Reno, Nev.
Vargas graduated with a bachelor's degree in journalism from the University of Missouri in Columbia, Mo., where she began her broadcasting career as a reporter/anchor for KOMU-TV.