The Real Housewives of Salt Lake City star Mary Cosby has had her husband by her side through all her ups and downs, both on- and off-camera. Viewers met Robert Cosby Sr. on the first season of the hit Bravo reality TV series. At the time, Mary revealed her marriage was "arranged," adding that "it was kind of in my grandma's will for us to marry." While navigating the highs and lows of reality TV, Robert Sr. and Mary also raised their only child, Robert Cosby Jr., together. In January 2026, Mary opened up about her son's substance abuse and mental health struggles as he found himself in jail. "At some point, I have to step back so that he can learn and he can make his own decision," she told host Andy Cohen during The Real Housewives of Salt Lake City season 6 reunion. "Unfortunately, he is learning the hard way but I'm ok with it. You don't want to see your kid suffer, but I know it's good and I'd rather him be there than dead." 'RHOSLC' Star Mary Cosby's Candid Quotes About Her Son's Addiction Battle Robert Jr. later died at the age of 23 in February 2026. According to the Salt Lake City Police, authorities responded to a call for an overdose at Mary and Robert Sr.'s home and found Robert Jr. deceased. An official cause of death was not immediately known, though 911 audio revealed Robert Jr. was administered a dose of Narcan, a spray designed to reverse the effects of a drug overdose. "Our beloved son Robert Jr. has been called home to the Lord," Mary shared in a statement to Us Weekly at the time. "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." As the Cosby family continues to mourn the death of Robert Jr., keep reading to learn more about Mary and Robert Sr.'s marriage: What Does Robert Cosby Sr. Do for a Living? Robert Cosby Sr. and Mary Cosby YouTube Robert Cosbry Sr. is an active leader at the Faith Temple Pentecostal Church in Salt Lake City, Utah. According to the church's website, Robert Sr. serves as a bishop, while Mary Cosby holds the title of first lady. In a rare appearance on The Real Housewives of Salt Lake City season 1 reunion, Robert Sr. praised his wife as "more than a first lady" at the church. Instead, he called her a "copastor" and his "equal." How Did Robert Cosby Sr. and Mary Cosby's Love Story Begin? Robert Cosby Sr. was previously Mary Cosby's step-grandfather and, therefore, not biological kin. According to Mary, her grandmother was adamant that her granddaughter marry her husband after she died, partly because she wanted the Bravo star to keep the family church alive and thriving. "Before she passed, she made it very clear that she wanted me to be the one to take her place in the church and inherit everything," Mary once explained on The Real Housewives of Salt Lake City per People. "That came with homes, money, our church and also marrying her husband." The couple got married in September 1998 and welcomed their son, Robert Cosby Jr., in 2005. Mary Cosby's Son Robert Jr.'s Ups and Downs on 'RHOSLC' Before Death at 23 Is Robert Cosby Sr. Featured on 'The Real Housewives of Salt Lake City'? Robert Cosby Sr. agreed to support his wife, Mary Cosby, and appear on The Real Housewives of Salt Lake City season 1 reunion special in February 2021. At the time, he told host Andy Cohen that he doesn't "like people messing with my wife at all" and was upset that her costars thought "we got married just for the money." As the seasons continued, fans wondered why Robert Sr. wasn't featured on the show more frequently. During an October 2024 appearance on Watch What Happens Live With Andy Cohen, Mary said her husband was holding a "grudge" against RHOSLC. "He's good. He's a man, and they hold grudges," she explained. "But once he gets over his grudge-holding, he'll be better." If you or someone you know is struggling with substance abuse, contact the Substance Abuse and Mental Health Services Administration (SAMHSA) National Helpline at 1-800-662-HELP (4357).