Robert Cosby Jr., son of Real Housewives of Salt Lake City star Mary Cosby, has died at the age of 23. Mary Cosby confirmed the heartbreaking news on Wednesday, February 25, 2026, via social media, expressing profound grief. The reality television personality shared a statement with TMZ, also signed by Robert Cosby Sr., saying, "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. We are grateful for your prayers and trust in the Lord to carry us through this time of sorrow."

Reports indicate that Robert Cosby Jr. passed away on Monday, February 23, 2026, in Utah. Salt Lake City Police Department officials responded to a call for a "full arrest/medical emergency" for a 23-year-old male, with the incident evolving into a death investigation upon arrival. While an official cause of death has not yet been released, reports suggest the incident is being treated as a possible overdose.

Robert Jr.'s life was marked by recent personal and legal challenges, some of which were touched upon during his appearances on Bravo's The Real Housewives of Salt Lake City. His passing comes just weeks after his release from the Salt Lake County Metro Jail in early February 2026. In January 2026, during the RHOSLC Season 6 reunion, Mary Cosby discussed her son's arrest and ongoing struggles, including a divorce filing from his wife, Alexiana Smokoff. Executive producer of the Real Housewives franchise, Andy Cohen, shared his condolences, calling the news "Devastatingly sad... This is every parent's worst nightmare."