Bianca Carrasco, a 29-year-old oncology nurse and mother of three, vanished from her San Antonio home on May 1, 2016, and has never been found. Josh Mankiewicz investigates her disappearance a decade later as part of Dateline's Missing in America Season 5. Bianca Carrasco was a dedicated oncology nurse who took her work seriously and showed up for her patients day after day before her unexplained disappearance on May 1, 2016.