Mary Cosby believes her son is "at peace" following his death.

The Real Housewives of Salt Lake City star confirmed the death of 23-year-old Robert Cosby Jr. on Wednesday (23.02.26), two days after police found his body when they "responded to a possible overdose" and the tragedy has made her "heart ache".

Speaking on behalf of herself and husband Robert Cosby Sr., Mary told TMZ: "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."

The medical examiner is still investigating a cause of death for Robert, who was released from the Salt Lake County Metro Jail earlier this month after a two-month stint behind bars.

He was jailed after he pleaded guilty to eight out of 14 charges, including assault and violating a pretrial protective order obtained by his 21-year-old estranged wife Alexiana Arian Smokoff. The remaining six misdemeanour charges were dismissed with prejudice.

Meanwhile, Real Housewives executive producer Andy Cohen has paid tribute to Robert and sent a message of support to Mary.

He wrote on Threads: "Devastatingly sad news out of SLC. 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."

Bravo also paid tribute to the reality star.

The network said in a statement: "We are heartbroken to learn of the passing of Mary's beloved son, Robert Jr. 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."

Mary, 53, previously admitted she was "shocked" when she discovered her son's struggles with drug addiction.

Speaking to Us Weekly magazine last year, she said: "I immediately started blaming myself, because I thought, 'You can't judge him and his life and his choices.'

"I don't believe in judging people. I'm just not a judger. I don't like judging people, and I don't like to do it. … If he's opening up enough to tell me something this crucial, then why would I judge? I have no choice but to sit there and receive it and accept it and hope that I can help him."

She noted Robert had "had a little bit of a setback" in his recovery at the time, but she prayed he "stays good".

She added: "I can honestly sit here and say he's doing very good."