Image Credit: Koury Angelo/Bravo Mary Cosby is grieving the loss of her son, Robert Cosby Jr. The Real Housewives of Salt Lake City star's child died at the age of 23. As RHOSLC fans grapple with the news of his untimely death, many are curious about what happened to Robert. Mary and her husband, Robert Cosby Sr., confirmed their son's death in a statement to TMZ on February 25, 2026, which read, "Our beloved son Robert Jr. has been called home to the Lord. Though our hearts ache, we take comfort in God's promise and in knowing he is finally at peace.