Is Mary Cosby Related to Bill Cosby? Rumors Debunked Amid RHOSLC Star’s Son’s Tragic Death
Feb. 26, 2026 — Salt Lake City Online rumors questioning if mary cosby related to bill cosby have intensified following the death of her son, Robert Cosby Jr., but multiple sources confirm no familial connection exists between Real Housewives of Salt Lake City star Mary Cosby and comedian Bill Cosby.
The shared Cosby surname has long fueled speculation about whether mary cosby related to bill cosby, particularly in the wake of Robert Cosby Jr.’s death on February 23, 2026, at age 23 from an apparent overdose, as reported by Primetimer and KUTV 2 News.
Son’s Death and Family Response
Salt Lake City police responded to an overdose call on February 23, confirming Robert Cosby Jr. as the victim. The investigation is ongoing, with no official cause released. Mary Cosby and husband Robert Cosby Sr. announced the loss on Instagram:
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. (Instagram)
Robert Jr. had struggled with substance addiction, discussed on RHOSLC Season 4, and faced recent legal issues including a November 2025 arrest.
Debunking the ‘Mary Cosby Related to Bill Cosby’ Rumor
Primetimer explicitly states Mary Cosby is not related to Bill Cosby. Her husband, Robert Cosby Sr., became her step-grandfather through marriage to her late grandmother, Dr. Rosemary Redmon Cosby, founder of Faith Temple Pentecostal Church. After Rosemary’s 1997 death, her will required Mary to marry Robert Sr. to inherit church leadership, properties, and assets. Mary, then 22, wed him in 1998.
On RHOSLC Season 1:
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. That came with homes, money, our church, and also marrying her husband. Don’t think it wasn’t weird, because it was!
The arrangement was not blood-related, based on friendship and family duty.
Social Media and Additional Coverage
Social discussions on X focus on sympathy for Mary’s loss rather than the mary cosby related to bill cosby query, with fans praising her motherhood (@Dustin_Cone). Reports from TMZ, The Sun, and Daily Mail cover the death without mentioning any Bill Cosby ties. Older Reddit threads similarly find no connection (Reddit).
Addblog echoes the debunking. No credible sources affirm the rumor, attributing it to surname coincidence.
