Robert Cosby Jr., the only son of Real Housewives of Salt Lake City star Mary Cosby, lived much of his life away from the spotlight, but his personal relationships eventually became a subject of public interest.
In 2022, at just 19 years old, Robert secretly married his girlfriend Alexiana, who was 18 at the time.
The marriage was officiated by a Salt Lake County judge on August 18, 2022, and the couple kept the union private for nearly a year before it came to light.
Mary Cosby reportedly discovered the marriage during filming for RHOSLC, and she was devastated to learn that her son had kept such a significant life event hidden from her.
The revelation sparked tension within the family, especially given Mary’s protective nature and her strong presence in Robert’s life.
To see what Mary Cosby has been through her whole life you know that Robert Jr was her ONLY baby and light in the dark. She just said she was fine with him being in jail because she knew where he was and wasn’t using which is a reality for too many people. For her to lose her… pic.twitter.com/Fg9i5zSga4
— 𝐓𝐢𝐚𝐫𝐚 (@sheistiara224) February 25, 2026
Despite the secrecy, Robert and Alexiana appeared committed to one another, with Alexiana stepping into the role of Mary’s daughter-in-law.
Alexiana herself remained largely out of the public eye. Little is known about her background beyond her young age at the time of marriage and her connection to Robert.
However, photos and court records confirmed the legitimacy of their union. For Robert, the marriage represented both independence and a desire to build his own life outside of his mother’s fame.
Tragically, Robert Cosby Jr. passed away in February 2026 at the age of 23. His death, reportedly linked to a possible overdose, left his family and fans grieving.
The news also cast a shadow over his relationship with Alexiana, raising questions about how the young widow would move forward after such a sudden loss.
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