There's a heartbreaking update to share about the son of a Real Housewife of Salt Lake City. TMZ reports that Mary Cosby's son, Robert Cosby Jr., has died at 23. Source: Chad Kirkland / Bravo The outlet reports that Robert died Monday in Utah. Salt Lake City police responded Monday night to a call for a "full arrest/medical emergency" involving a 23-year-old male. Authorities reported that the situation became a death investigation upon arrival. TMZ adds that the official cause of death has not been confirmed, though officers initially responded to what was described as a possible overdose.