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.”