Robert Cosby Jr., Son of 'RHOSLC' Star Mary Cosby, Dies at 23

Months before his death, he spoke about his mother's unwavering support during his addiction and mental health struggles.

Feb. 25, 2026 at 10:36pm

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Robert Cosby Jr., the son of Real Housewives of Salt Lake City star Mary Cosby, died on February 23, 2026, in Utah. Months before his passing, he had opened up to PEOPLE magazine about his mother's support as he navigated his addiction and mental health issues. Robert Jr. had a history of arrests related to substance abuse and domestic incidents.

Why it matters

Robert Cosby Jr.'s story highlights the challenges many young people face with addiction and mental health, and the importance of family support during those difficult times. His death is a tragic loss that will likely impact the RHOSLC community and shine a light on the ongoing need for better resources and support for those struggling with similar issues.

The details

Robert Cosby Jr. died on February 23, 2026, in Utah. Months before his death, he had spoken to PEOPLE magazine about his mother's unwavering support as he struggled with drug addiction and suicidal ideation. Robert Jr. had previously opened up about his substance abuse issues on RHOSLC, including his use of prescription medications like Xanax, Adderall, and OxyContin. He had a history of arrests related to his addiction, including a DUI in 2022 and multiple charges in 2025 for assault, criminal trespass, and violating protective orders.

  • Robert Cosby Jr. died on Monday, February 23, 2026.
  • In November 2025, Robert Jr. spoke to PEOPLE magazine about his mother's support.
  • In November 2024, Robert Jr. opened up about his addiction and mental health struggles on RHOSLC.
  • In 2022, Robert Jr. was arrested for a DUI.
  • In 2025, Robert Jr. was arrested multiple times on charges related to his addiction and domestic incidents.

The players

Robert Cosby Jr.

The 23-year-old son of Real Housewives of Salt Lake City star Mary Cosby, who struggled with drug addiction and mental health issues.

Mary Cosby

The star of Real Housewives of Salt Lake City and the mother of Robert Cosby Jr., who remained supportive of her son during his addiction and mental health struggles.

Alexiana Smokoff

Robert Cosby Jr.'s ex-wife, who filed for divorce from him in November 2025 after three years of marriage.

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What they’re saying

“My mom has been there for me in every way. I love my mom.”

— Robert Cosby Jr.

What’s next

The Salt Lake City Police Department is investigating the circumstances surrounding Robert Cosby Jr.'s death.

The takeaway

Robert Cosby Jr.'s tragic passing underscores the ongoing need for better mental health and addiction resources, especially for young people. His story serves as a reminder of the importance of family support and understanding during these difficult battles.