Robert Cosby Jr., Son of ‘Real Housewives of Salt Lake City’ Star Mary Cosby, Dies at 23

In recent years, Mary Cosby had spoken publicly about her son’s sobriety journey and the challenges he faced.

Mary Cosby attends Las Culturistas Culture Awards at the Orpheum Theater in Los Angeles on July 17, 2025. Maya Dehlin Spach/Getty Images

Robert Cosby Jr., the 23-year-old son of “Real Housewives of Salt Lake City” cast member Mary Cosby, died Wednesday.

“Our beloved son Robert Jr. has been called home to the Lord,” Cosby wrote in an Instagram post. “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.”

Cosby did not disclose additional details in the statement. The announcement prompted an outpouring of condolences from fans and fellow reality television figures across Instagram and Threads.

Bravo, the network behind “The Real Housewives of Salt Lake City,” shared a message of support on its official social media accounts.

“We are heartbroken to learn of the passing of Mary’s beloved son, Robert Jr.,” the statement read. “Mary is a cherished member of our family, and our thoughts, love and deepest condolences are with her and her loved ones during this incredibly difficult time.”

Executive producer and longtime franchise host Andy Cohen also responded in a post on Threads, calling the news “devastatingly sad” and adding, “This is every parent’s worst nightmare. My heart is broken for Mary, and I am sending all my love to her and Robert Sr.”

Mary Cosby has been a central figure on the Salt Lake City installment of the “Real Housewives” franchise since its 2020 premiere. As one of the original cast members, she became known for her outspoken demeanor and for navigating deeply personal family matters on camera. She stepped away from the series during its third season before returning in a later installment.

In recent years, Cosby had spoken publicly about her son’s sobriety journey and the challenges he faced. During a September appearance on SiriusXM’s “Reality Checked,” she reflected on supporting him through difficult periods.

“I can just only push him, encourage him, and love him. And that’s what I’m doing,” she said at the time. “I know he’s got all the tools and he’s got all the will, the willpower that he needs and the support.

“I have hope, and I believe in him.”

Following the news of his death, tributes from fans and fellow cast members continued to circulate online, with many offering prayers and messages of comfort to the Cosby family as they grieve.

“Thank you for sharing Bubbs with my family and the world. He touched many hearts and this loss has broken mine,” co-star Angie Katsanevas wrote. “I will forever remember his kindness towards Elektra, his handshake and eye contact, and his soft spoken voice ‘Love you Mom.’ I am here for you ... May god bless your family and may his memory be eternal. I love you Mary.”

Heather Gay, another co-star, commented: “There are no words big enough. We love you Mary.”