Article continues below advertisementMary Cosby has heartbreakingly lost her son, Robert Cosby Jr., at age 23. The Real Housewives of Salt Lake City star's only child devastatingly died on Monday, February 23, in Utah. While his cause of death has not been confirmed at time of press, police responded to a possible overdose and launched an investigation into his death upon arrival, according to TMZ.Cosby confirmed the tragedy in a statement to the news outlet, writing: "Our beloved son Robert Jr. has been called home to the Lord.