Bravo/Jocelyn Prescod/Getty Images The 23-year-old son of Real Housewives of Salt Lake City star Mary Cosby has died, according to TMZ . The cause of Robert Cosby Jr.’s death has yet to be determined, but the site reports that authorities responded to a call in Utah on Monday night about a possible overdose. Cosby Jr. has appeared on Real Housewives several times with his mother, where his alleged drug problems were part of her storyline on the show. Read more at The Daily Beast.